Which event? At Oscar's place, the only table in the tournament room with 4" pockets is the #1 table, the rest are 4 1/2". I believe they switched the #1 table with #4 for the tournament because that's the streaming table. Unless they changed them after the event. The Gold Crowns in the rear of the main room are sub 4 1/2". I'll try to remember to take some pictures the next time I'm there.
Yeah, I don't exactly think smaller pockets are a big factor in improving accuracy, I believe the coordination is mainly due to diligent repetition. It is true that after shooting a bit on a tighter pockets I sharpen up a bit, the smaller pockets enforce diligence.