So how far can or will you try to take it? Like Alec in The Black Stallion with no tack of any kind when he rides on the beach? (my favorite movie by the way)
But I don't ever expect to ride bridleless on the trail, if for no other reason than he will stop to eat grass where ever he wants, or take off for home whenever he wants.
If you can do it, great, but that is not everyone's holy grail. My holy grail is the perfect trail horse, but he need not be bitless or bridleless.
My old Arabian I could ride with just a rope around his neck. And if a horse neck reins, that is actually pretty easy to aspire to. But I have never even tried it on my current trail horses. I just don't have the desire to do it. Maybe if I had an arena it would be something to play with, but I would never actually go anywhere without at least a halter on my horse.
Even a dog needs a leash to be safe. Sure he should come and heel at your side, but all it takes is once for him to get killed out in traffic. A 1000 lb. horse that doesn't listen to you, even just once, has the potential to do a lot more damage if it gets loose than a dog. If you don't fear for your own safety, at least consider what might happen to your horse if he gets loose. Unless you just always plan to ride in an enclosed space, in which case I guess there won't be much risk to the horse. But I want to ride where there are no fences.
One time I rode my old Paint gelding over to a neighbor's house in just a halter. I was just being lazy, but they were all impressed. I honestly don't know why, because basically any horse you should be able to ride in a halter, right? Just not with as much finesse and control as a bit or other bridle arrangement. But I really don't think riding a horse in a halter is a big deal.
And riding a horse without any kind of head gear, outside an arena anyway, is well, kind of naive? Let us know how that works out, because I would be really impressed if it did!