Everybody is going to play less than their capability right at first on a new to them table size, regardless of that table size, so if that is all you really mean even though it isn't what you have been saying then that is a very obvious given but it doesn't last very long as people very quickly adapt. Of course people would suck more at brand new things the first time lol.
But if you are confident that you know of players who over time have a significantly different win rate depending on the table size, which is what you have actually been saying, then post their names here in this thread so Mike can look to see what the data, as opposed to your theory and perceptions, actually shows. He has already done this many, many, many, many times over the years and the actual performance data repeatedly shows that you will have a similar success rate regardless of table size (mostly because everybody
tends to perform better on smaller tables and worse on bigger ones, and since your opponent is also playing on the same table size as you your win rate doesn't actually change much with table size).
Here is mikepage in the post below from earlier this year specifically asking for examples of people who perform significantly better over time on one table size over another (or in one game over another) if someone thinks they know of an example so he can look into it as he has done many times before and see what the data actually shows for that person/s. You repeatedly keep saying you know of tons of examples of this, so here is the time to post up their names as there is no need to continue to speculate on whether you are right or wrong when we can find out without doubt.
How strong is a 604?