I prefer barefoot, and will make extra accommodations to transition my horses to ride barefoot. (such as boots). But I am also a believer that there is no one size fits all solution for every horse, anywhere in the horse world, and that goes for feeding, handling, training, and hoof care as well.
I do NOT believe every horse out there can go barefoot. I purposefully purchase horses I believe CAN. Since I do my own barefoot trimming, it's not only a preference, it's also much more cost effective for me to have barefoot horses.
I do personally believe barefoot trimming has some advantage over shoes, but I also believe there are some hoof issues that can only be managed/resolved with shoes on.
Just my $.02