I don’t know what “use it against the DM” means. It’s not a concern I have when I GM.
In some games hostile players try to trip up the DM when they are imrpovising. If the DM says the Black Swamp is clear of monsters at 7pm, but then at 9pm the DM gets confused and says there is a black dragon n that swamp, the player(s) can leap up and say "Nut Uh", you said the swamp was clear. And the submissive DM will hang their head down and say "yes player".
Regarding what players like, I think it varies enough that saying what “most” like is kind of silly.
It's not for generally terms like "action" "adventure" and such things.
Sure, I get that. When I GM D&D, I tend to prep lightly, and mostly between sessions. Like, once the session ends, we have a good idea of what the next one will bring, so I prep accordingly. It likely is pretty brief… some bullet points and ideas for locations and NPCs and so on. Probably having some generic statblocks ready. That’s about it.
But I know that’s not something all or even most GMs may be comfortable with.
I might do...oh, 500% then you do. But I like creating stuff. I'm doing it during the game to, always tinkering and altering.
In my opinion that's an extraordinarily wrong position to hold and I hope to God that nobody who reads that takes it to heart. A great many people enjoy roleplaying and get a lot out of it, even if they aren't(and almost all who enjoy it aren't) actors so skilled that they can regularly evoke strong emotions.
"Real" emotions are what make RPGs great and unique.
I just do not really get the whole "skip the RP and get to the good stuff" attitude. The RP is the good stuff! And yeah, RPGs have other elements too, and it is more interesting if you vary things, but it just felt fundamentally wrong to me to describe such interactions somewhat pointless or inconsequential. They are not, they are the heart and soul of the game. Doesn't mean you could never start with action and have RP to establish the emotional context later, but then I'd definitely prefer it to go in that order in the world too. Like if the PCs arrive at "the adventure site" on purely mercenary reasons, but once there encounter people affected by the situation and then it becomes more personal.
I would never skip RP for other stuff.
For me it is RP ruining the game. Like the example were the players are sort of happy hanging around town for four hours and not doing much exciting. It is bad enough there are players that sneak into action adventure games and do that. The player that makes a character like Slog the Dragonborn Warlock, slayer of monsters...then the player wants to go shopping for two hours and like "roll a d20 if find boots on sale".
Worse are the players that just have their characters sit around town and then complain to the DM that they are a bad DM. When the players were just like "we sit at the tavern, again". And sure if the passive DM does just sit there, they are to blame....but there is plenty on the players too.
Question: If you were in a game where you wanted to RP for hours, and the DM only wanted to "focus on the game". Would you be willing to come over early to do nothing but role play? Like say the game starts at 6pm, would you agree to come over at 4pm for pure RP? Or must RP only take up game time?