Competition, Heart, and Knowledge makes players improve and evolve, not conditions. The innate feeling of 'you won't beat me, ever.' Or you robbed me 2 years ago, but you're not going to like any of it today. It's heart. With equipment and conditions being equal, it's all about those 3 components.
Say on a 4 1/2" table player A can run out 4 racks on the regular, well, player B better figure out how to run out 5. A breaks like king kong. B better figure out how to break like Godzilla, or figure out a move that A doesn't know.....yet. Decreasing the pocket size only makes A's 4 rack average 2 and B's 5 a 2.5. All it does is shift the curve. Nothing improves. Heart, talent and knowledge drive improvement.
I want to see what B looks like in the electric chair. I want to see B dog it after after sitting for 20 minutes. I want to see B kick in what was a lock down safe from that MF'er after sitting for 3 straight racks, get position, and make 4-1 turn in to 4-5... and see that look in his face that says he's about to crush A's soul. That's heart, that's entertaining, and that's pretty much gone. That used to be high end pool, until it was blown up, sadly.
Regardless of the equipment or conditions, on average, the cream will rise to the top. People find ways to up their game by having the innate fire, talent and knowledge, not because the pockets keep getting smaller.
And for the record, I'm really enjoying this conversation and am not trying to be overtly argumentative if it comes across that way.