Ok, I’ll throw my hat in the ring.

Metagaming is fine, actually.

Obviously, don’t read the module you’re a player in, but knowing to use fire on trolls is just basic game knowledge. It’s ok to be good at the game, because it is a game. If you’re playing dungeons and dragons, or pathfinder, or any other rpg that spends most of the pages on combat rules, then you’re playing a tactics game. I like tactics games (I’m not good at them, but that’s a separate conversation).

I cannot tell you how frustrating it is to come up with a brilliant plan to do a thing, and then be told that I’m not allowed to do it because me figuring out the puzzle is metaknowlede.

It is exclusively in the tabletop rpg space that being good at the game is considered a bad thing. It’s in a similar vein that I hate tutorials in video games, especially when I’m being prevented from doing things that I already know how to do (because I’ve been playing games for multiple decades now and I have some amount of media literacy) for no other reason than the game hasn’t taught me yet. So arbitrarily, I’m not allowed to use fire damage on the trolls until some npc tells me that trolls are weak to fire? That’s asinine.

If you want to play let’s pretend with dice, that’s fine. just be honest about the kind of game that you’re running from the get go so I know not to join your table.