I do know that for Herolab for Pathfinder (maybe D&D Beyond?) has it in the settings to meet the requirements for Society play, so it will show if the character is valid or not. But if the player doesn't use that, it's up to the GM to validate it.
That is helpful for some players and some GMs, but I wasn't referring to sheet/character issues so much. Specifically with Pathfinder, it was GMs changing things/stats in the scenarios (which is flat against the rules in PFS, unlike Missions), changing the way certain class features or feats worked just because they didn't like them, and/or enforcing their house rules at the table.
I will never understand the GM mentality of "I have to challenge the players" or "I need to teach this person a lesson for daring to have fun building characters and bringing them to my table the way they do!". When I sat down to run PFS games, I would ask my table if they wanted me to run "story mode" (focus on RP and run my NPCs as easily as possible), "standard" mode, or "ruthless mode" (I'd use optimal tactics and focus fire hard as the material I had to work with allowed). That question and its answer, and providing the requested experience, was the only thing I concerned myself with past knowing the rules.
I say this as a nerd of the nerd community, but the simple fact of the matter is there are a lot of petty shits in our collective ranks that have no business guiding anyone's fun.
