Board, distance, and darts are all exactly the same for all players of the game. Same for table tennis. In the early aughts, there was a big controversy in table tennis when the ball regulation was changed from 38mm to 40mm in diameter. Some pros threatened to quit. Somehow the sport survived, you can't buy a new 38mm ball today for love or money.
I think a lot of the perceived "benefits" of practicing on really tight tables, then looser tables is a question of base rate error. If I practice on a smaller rim, I might be a 40% free throw shooter, move to a regulation rim and move up to a 60% free throw shooter. Now if the little rim has persuaded me that I'm actually a 40% free throw shooter, and then suddenly I perform at 60% when I move to regulation, I was just deceived by the little rim about how good I am. I was always a 60% shooter on regulation. Someone who practices and plays on regulation equipment is just more likely to have an accurate self assessment about how good they are on regulation equipment. In a contest of man v. man, the equipment shouldn't be a factor, which is different that man v nature games like golf, skiing etc.
If Snooker can standardize, and it doesn't seem to have killed that game, certainly competitive pool can as well. We just elect not to.