Endgame Maps

I was just thinking about this the other day and idk if someone has already made this suggestion or not. What makes Poe1 endgame fun overtime is that the player can decide what they want the endgame to be like for them. What if, when running maps, the player can decide whether or not they want to kill the rare monsters or kill the map boss to complete the map? I know some people like clearing maps and I also know that some people just like to kill the boss. I was thinking what if the players could choose which one they want to do instead.