I've seen a few supposed experts ruin horses and I've seen beginners do right by their first horse as well as what the article talks about. I think that new owners who want to learn, not to proud to ask for advice, are willing to listen to that advise and aren't too fearful to use that advise can do ok.
I don't think common sense and listening to horses can be taught. Certainly not quickly. But I was the person who started by buying some horses and keeping them. None of them starved. None of them turned mean. None of them became a nightmare - literally.
Mia had a lot of issues, and since I was totally new at the start, it took a long time to work through many of those issues. I traded her, after 7 years, to a guy who wanted her primarily as a brood mare, but who also enjoys her competitiveness (they like racing their horses informally). And when she isn't heavy with broodmare duties, she is "a kid's horse". She still spins hard sometimes, 1-2 full circles, for no known reason, and then looks back at her rider as if puzzled by what has happened. But she is still considered a kids horse because she is responsive and tries hard, and the very open country she now lives in agrees with her.
Lilly was a totally unbroke 6 year old Arabian mare. Yes, we hired a pro to "break" her, and to teach us about horses as she did so. Lilly was the horse my youngest started riding lessons on. She & Trooper eventually developed an intense dislike for each other, and the rest of the family wanted to keep Trooper. So we sold Lilly in 2010, and she has lived since about 2 miles from here. I'm told she is a good trail horse. I believe it, because she was very sweet.
Trooper was a ranch horse. He was loaned to a different ranch, had holes the size of the palm of my hand spurred into him, and still has scars 9 years later. He dislikes men and me in particular, but he's the only horse my youngest really enjoys riding. He is also a very good ride when I ride him...but we don't enjoy each other, so I ride him a few times a year.
Cowboy was a BLM mustang who had at least 6 previous owners. He was used for several years as a lesson horse. He was given to us, free, because he was rebellious and inclined to run off with people. A few years later, he still is very afraid of round pens and only now is getting OK with an arena. He is also a totally reliable trail horse. He is the horse my grandkids will almost certainly learn to ride. Riding yesterday morning, there was a tricky spot with lots of rocks and steep slopes, so my daughter and I dismounted Trooper and Bandit and led them across that drop into and climb out of a wash. My DIL rode Cowboy, because everyone knows Cowboy will figure it out. He is a wonderful 13.0 hand fat pony. Even if he was free, including free delivery, because he was rebellious.
Bandit is the horse I traded Mia to get, sight unseen. I was told he was good, fast, but would get very "feisty" at times. When he arrived, and needed to deal with a human neighborhood and a type of desert where visibility is very restricted, he was very spooky. Put a lifelong rider once onto his neck, bucking and resisting.
Yesterday was only the 5th or 6th time in the last 4 months that I had him out in the desert. We went into a section he hadn't been in for almost a year. He spent the first 15 minutes being his super-aware self. But he would go past things, reluctantly, with just a touch of my heels. And after the first 15-20 minutes, he settled down. At one point, we were passing some machinery that was humming, and just past the machines was a teddy bear cholla that was about 6-7 feet tall. I figured if he did anything stupid, I was going to get a shoulder full of teddy bear cholla. Look them up. But I decided to trust him, and he behave beautifully. I think he may someday rival Cowboy for being sensible and reliable...and maybe be that way in a year or so.
Now lets discuss the other side. A neighbor about 1/2 mile away told everyone we would fail as horse owners. And SHE had owned horses for 40 years, and owned 3-4 horses at the time. WE would be a total disaster.
Our farrier noted, however, that she traded horses out about 4 times a year, always complaining that the sold horse had turned out to have problems. After listening to her for a couple of years, the farrier told he SHE was the one with problems - that her horses couldn't compensate for having an idiot as an owner. Got him fired, and the woman moved away about a year later. Still searching for a well-behaved horse...
My SIL's grandmother is wealthy, and raised a lot of horses. Usually had about 20. Showed them and competed. He was required to go help her every weekday. His advice on horses was "Never turn your back on a horse. They can't be trusted.
After spending some time around Mia and Trooper and Cowboy, he admitted my horses were not anything like his grandma's horses. But of course, his grandma was "qualified" to own horses. He had owned them her entire life. She raised them and competed and showed with them. SHE was qualified. And of course, I am not. But my SIL trusts my horses, and refuses to even visit his grandma's place.
Heck, the place were Cowboy was a lesson horse was run by a woman with 40+ years around horses, who gave lessons and had spent decades showing and competing. Yet he arrived terrified of round pens and very uncomfortable with arenas, convinced his best option was to get a rider off of him. And now I plan to have my grandkids learn to ride by riding him.
I'm not buying the "Need years of experience to own a horse" or "Need years of lessons to ride a horse" lines. It isn't NEW owners who ruin horses. It is BAD owners. People like the professional cowboy who spurred bloody holes thru Trooper's skin. Or the lady who kept buying and selling horses, looking for one who would be a trustworthy trail horse.
It isn't too hard to figure out how much a horse needs to eat. If they lose weight, feed them more. If they gain weight, feed them less. If they have special needs, work with a vet or a more experienced horse owner to figure out what to feed them.
A newbie who just buys a horse WILL need good advice, and won't know -at first - what advice is good and what is bad. But most horses are forgiving, and they recognize if someone is TRYING to do right by them. And there are a lot of good horse owners who will gladly give advice - if asked.
I've had people ask about getting horses. I tell them about Mia, and what we went through with our horses. If they still are interested, I give them the name of the lady who did so much to help us, and who trained Lilly and Mia and who worked with Trooper. But there are also a LOT of experienced people I wouldn't allow to get on my horses.
And while neither my horses nor I are perfect at anything, the trend is our friend. We are all improving. Together. But then, we - my family - pay attention to our horses. I'm not sure that can be taught.