We have a vaulted ceiling with 8 cans on one side and 6 on the other (due to a covered patio jutting into one corner of the room). Ours were ivory "eyeballs" when we moved in and my dh replaced them with white ones. Our ceiling is pretty sloped though; it goes from 9 feet hight to 15 feet high in about 13 feet. (We also have 6 on the vaulted ceiling in the living room too). I never even considered if you could have regular ones. Are the "eyeball" ones just totally dated, don't look good or do they cost more? We do occasionally adjust where the lights are aimed in the kitchen area. We've never adjusted the living room ones.

I have sloped ceilings with 6 in cans. I got the sloped cans because this kitchen has no windows and it needed as much
Iight as I could give it. If your ceilings are really high , then what are you illuminating? The ceiling or the living space?