Unplayable if you go AFK

I wish I could get away from the screen for some time and when I come back to continue from where I left it off.
Maybe it can be possible for private/single games - who knows.
Wonder if it ever was like that before (d2, d1 (sarcasm))?
But in reality I lose sadly all the progress I did and must start from the very beginning.
That makes me care less with every single disconnect.

in d1 and d2 you did not lose your progress. what you cleared is cleared forever (in single player game).