Originally posted by lolof
I think it's quite useful - I don't think I will remember without it. Do you mean you could still recall the opponent's last move?
You don't need to know the last move to 'play the position'.
Evaluating a position on the board eliminates "What is this guy up to with that last move". That can be distracting from the position of the board. When you solve a puzzle often you do not know what the last move was.
I like to know what the last move was, and this probably gets me in trouble sometimes because I'm concentrating on what that last piece moved might be up to... and what's really going to happen has nothing to do with the piece just moved.