endgame maps checkpoints bosses

in maps that have bosses and other objectives, but specially bosses, if we kill all rares in the map, wouldnt be a good add/be able to the checkpoint of the boss appear to the players even if we didnt discover?

It happends alot of times for me to just full clear a map with the boss objective but I focus first on the rare monsters, and most of the time i already went near the boss but i didnt got the checkpoint. so i have to walk all the way to the boss when i finished the rare monsters objective.

Also i think there is a bug because sometimes after u finish the rare monsters, the little orange boss icon doesnt appear in the map. Sometimes it does, sometimes it doesnt. and we have like i said, to check all the corners we went to see if we miss a checkpoint.