i have never noticed this.
I mean is this intentinal? should darkness be a factor in the game?
Nope, and I'm not sure why the OP is assuming it should.
Honestly, in a isometric party-based game (so with many characters under your control at any given time) where there isn't even a "quick switch" option to "alternate between torch and weapon" I could only see it becoming a very tedious annoyance.
