system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] Why did Thanos have to snap his fingers? Is there a rule that there has to be a physical action to make anything happen? Tje rest of the stuff he does with the stones he just thinks... Too much of the plot hangs on him rubbing to fingers against each other.
gpt
He didn't have to, but the stones play along with your assumptions, and once you've got the idea that to activate it you need to close your fist or snap your fingers... that's how they work for as long as they're in that gauntlet. 

They are, if anything, *too* amenable to the user.