Hi I compete at a high level and been involved in training horses through to grand prix. Soundness is up to good hoof management, and barefoot or not you need a good farrier.
My warmblood made is barefoot and she's training flying changes, pirouettes and baby piaffe. She's has never had hoof problems and no one has every noticed she's barefoot. She's very competitive and hopefully will continue to be so unshod up to gp level
However some horses will need to be shod, it also depends on the surface and if it wears your horses hooves down quickly.
It what works for your horse. Yes barefoot with a correct trim has it's advantages as far as shock absorbing qualities. But it's not for every horse, crumbly ak hooves won't handle it.
I'd love to know more about shoes for limb support as I just don't underhand this concept entirely
Just a note- I do a normal trim lie you would for shoeing. Not a strausser or the like trim.