You are trying to trick me into a realism vs fun debate, aren't you? Nope, sorry not gonna happen :P
But, for the record, i would side with fun every time.
No. Divinity Original Sin 2 isn't an art game where it can sacrifice fun for whatever it is trying to achieve.
So don't worry it isn't a realism versus fun debate.
It is engagement versus ease
Needing a lockpick in order to lockpick is more engaging then simply not requiring it.
