My 2 cents: If your horse does well with it, go for it. Like you and a few others said, it depends on the individual and it's completely different for each horse. It's totally unfair to say that EVERY TB needs shoes, because there's a lot of different factors and each horse is an individual with different genetics and health history that change how they wear or don't wear shoes.
In my opinion, going barefoot as often as possible is best. I like to go all natural as much as possible :) Reading the Soul of a Horse by Joe Camp is what really made me change my mind; I think it's best to try and go barefoot in every situation. Shoes can be good at first, but over time they can compromise the horse's hooves and health, and be more harmful than good. But then again, it depends on the individual horse. Here's a link to the Soul of a Horse blog: The Soul Of A Horse Blog | Joe Camp Official Blog | Horses | Trust | Relationship
So, I think you should definitely try barefoot and see how it works and if you need to feed supplements or not. I think the possibility of having huge major problems and having your horse be lame more often than not is very, very rare... if anything, it'll probably be something more low key that you'll be able to recognize before it becomes a problem and you'll be able to make a change. Hope it works out for you, I think it'll make your horse happier