I think the one thing most people on this and the other snooker vs pool threads are missing is the size of the balls. If anyone actually has alot of experiance moving about from different tables between bar box pool, 9-foot pool, 2 shot 8-ball pool, and snooker they would notice the biggest problem adjusting from each game is not the size of the pockets, it is the size of the balls going from 2 1/8 to 2 1/4 which is a huge difference in the feel of every shot on the table. This is the main reason you see snooker players miss more shots on a pool table then you think they should.
Aiming is not honestly harder on a table with snooker cut pockets. The pockets are smaller and cut round so there is no horn, this take adjustement in the way you aim. I went to Australia and found out fast that the old boston cut 9-ball tables I was so used to were virtually non-existent and instead I was left with 2-shot 8-ball tables, 3 1/2 X 7 but with tight snooker cut pockets. I sucked at the start shooting on those. A month later I was in a league and beating everyone on my team for cash. Some of the top people in the city of 1 million people and I could go with any of them, putting 3 and 4 packs out there on those tight pocket tables shooting with a 12 1/4 9-ball cue despite the 2 1/8th balls. I am a pool player first, but I adjusted to the tighter snooker cut pockets and still took my place at near the top of the pack in that game.
Now I have played a fair bit of snooker as well. I am by no means great, but I have a 56 high run on a tight 6 X 12 and countless 30-45 runs. I have a friend who played in the Alberta snooker championships against Tom Finstad and in the race to 7 Tom had 4 centuries and my buddy had 2. My buddy has also played a ton of 9-ball and is very good, he is not the best in the city though despite being by far the best snooker player in Calgary. Tom Finstad has played in the SML event and despite being a pretty near pro level snooker player (I think he is the current Canadian champ actually) he gets drilled. The game is totally different due to the size of the balls.
Going from a pool table to a snooker table is harder because pool players get the routine and feel of playing balls off the horns of the pocket to make a pot. On anything 2 feet or closer to the rails a pool player aims at the horn, not the pocket, because if you hit the closer tit it is going to bobble. On a snooker table you cannot do that because the horns are rounded, you need to actually aim at the pocket, and this is what makes alot of pool players miss. They shoot it like they shoot pool, and you CANNOT do that. Going from a snooker table to a pool table does not quitet give the same problem, you dont miss if you play a pool shot like snooker and hit the heart of the pocket. What burns them though is the size of the pool balls. After playing 2 shot 8-ball for a couple hours and then trying to play on the rare 9-ball table i could find it was amazing how you actually miss shots you would make on the tight snooker cut pockets, the aiming is all wonky due to the larger balls and it normally took me a good 15 minutes to get the feel back for shooting real pool. This is me, a person who has played alot more 9-ball on 9-foots then anything else. The difficulty for a true snooker player who never plays on those 9-foots with the larger balls though, they will miss shots that will shock you due to those larger balls and the unfamiliar angles they produce.
It is not something that you can explain that well. I think alot of people on these threads do not have alot of experiance on both tables to realize the true problems. They seem to me more like the person who once shot for a couple hours on a snooker table, bobbled all the shots because they never adjusted to the table and the true way to aim, and then they decided snooker players were gods and never played snooker again. If you actually have played alot on those tables, snooker or 2 shot 8-ball, you can get the hang of those tables ral fast if you know what you are doing and I was running alot of racks on suposedly tight pockets and at the same level of play relative to the other players within 2 months of playing that game.