I have long had Pathfinder 1st Edition houserules about quick Diplomacy checks and informative Knowledge checks. My players and I like campaigns where the PCs can negotiate and plan rather than simply fight. We continued these houserules into the playtest. I was ambivalent about it at first, since it does alter the impact of the PF2 changes, but I did not want to taint the survey data by having my players report that diplomacy and knowledge checks no longer worked properly.
Then my wife, a beloved cunning vixen, made demands for better roleplaying. She wanted to play a paladin of Alseta rather than any of the gods included in the playtest, because that fit her goblin mind-quake-survivor paladin's backstory better, so I created proper anathema for Alseta (paladins of Alseta are not going to fit into kick-down-the-door dungeon delves, because they respect doors too much). And she roleplayed it well. Her human mountain-nomad barbarian wanted better climbing rules, so she got them, too. I had told her that her job was to stress-test the system, and she not only is doing so, but she sees the stress points in advance and starts fixing them before breaking them.
Seriously, she is doing a wonderful job displaying how the PF2 background system that fix a lot of customization bottleneck complaints discussed in the playtest forum. This is good data.
Then its seems from our 2 points of data (Plenty to draw conclusions! Plenty!) that many of our house rules seem to originate from the rules constraining roleplay in some way. Have most of your changes been adjusting or adding class feats? or more systematic. Out of curiosity, what were some of the changes to the climbing rules you implemented?