From a "barefooter's" point of view, I'd say it's a real compliment to that a farrier DIDN'T insist on shoes.
I don't really have any hard-core jumpers that I trim, just the 2 ft jumps, etc, but they do fine barefoot if they are adjusted. It's just not the "thing" around here to do jumping so much. It's more of a Western riding area. I do some Polo horses, , dressage, barrel, etc and the high speeds, turns and sudden stops don't pose a problem at all. Keeping them on a regular trim cycle, with a balanced trim, will keep them from ever chipping/cracking on you and for traction, you can't beat a barefoot horse and he'll probably stay sounder for it. The frog will have a chance to absorb some of that impact and is sort of like a little tire tread that offers good grip.
Try keeping him barefoot, you can ALWAYS resort to shoes if his feet start to suffer, right?