Ppl would just look up things on internet then.
If the story were as short as d2 and there were no endgame content sure whatever. Wasnt like it quest marker were needed in d2. “Go find den of evil” u went outside town and the first thing u find is den of evil. Later on just teleport around. I dont see the point.
My guess is that more ppl would just get annoyed consider d4 is gonna be a open world and pretty big. In a single player game like zelda sure. In a arpg not rly. Ppl just dont seem to enjoy that.
Turn on/off quest helper is kind of common though and d4 will prolly have that.