Kraydak said:
So rather than making perception rolls to find out what the mastermind's intentions are (in a general sense), I can just ask if I can recover my abilities? If I can't, he is still near. If I can, no need to burn a see-invis.
One-scene duration effects work decently in cinematic games. Real life (and DnD) can be much messier. DnD is also a generic enough game that it should cater to people who want a more nuanced attitude towards adventure structure.
At most, all you know is that the encounter isn't entirely over (and that's if I dignified that question with a response.) You can guess all you like as to why, but a decent DM would keep you on your toes.
It could be that there was a pit trap in the room, and there's a goblin hiding behind a curtain waiting to pull the lever.
But you don't spot a goblin.
Maybe something really bad happens when you try to loot the bodies. Or take the stone from the altar.
But nothing does.
So maybe the mastermind is still there, waiting to stab you as you leave the room. But none of this helps you figure out where he is, or who he's going to stab, or at which precise moment. Maybe he'll change his mind.
And to be honest, if I had players that were constantly trying to get around using abilities in game because they thought there was something there due to out-of-game knowledge like abilities not refreshing, I probably just wouldn't answer until a new encounter did start, every time (Two rooms later, when they encounter a pair of bugbears: "Oh, yeah, all of your per encounter abilities have refreshed.")
The point is that using "Hey, my abilities haven't refreshed" wouldn't last very long as a viable way to sense danger, or even help you to figure out what that danger may be, if you tried to abuse it in this way, against any DM with common sense.
Also, you're assuming that "I try to refresh my abilities" would be an option a player would take as opposed to the DM telling you when they refresh, or mentioning that they have at the beginning of a new encounter (as opposed to at the end of one.)