Pour ins, or a heart bar pad, or a heartbar shoe are things to talk to you vet and farrier about. All are going to help stimulate the frog. In not wet weather my farrier also has me not pick my horse's feet and it helps a lot in keeping the frogs stimulated. We are trying a heart bar pad w/ pour in this next trim to get the high foot to grow a bit more frog - I can take pictures!
Straight shoes, I agree, can do very little for a horse, but using a complete farrier's kit to shoe your horse in a completely custom way can be as good as barefoot. It's unfortunate that I need shoes at the level of competition I am doing, but really excellent, innovative farrier work is as good or better than barefoot for the competition horse, IMO.
They say money doesn't buy happiness -- well happiness doesn't buy horses!