You should be able to resurrect your party members in maps, with a caveat

I know we're supposed to only be able to have 1 life per map, but when you're partied with someone, the maps tend to be more difficult. With that said, there is an option to resurrect dead party members, but it's not allowed in maps, which is the basic end game pillar.

The caveat I mentioned is that you should be allowed to resurrect your party member(s) who died only after a certain monster slain threshold has been achieved, whether that is 1 or 2 rares, or just # of monsters.

This way, you're still punished for dying, but if your party member can push through the map further alone, you're rewarded with a resurrection charge. Perhaps only 1 per party member. I'm sure this can be balanced.

Yes, don't die is the important part, obviously, but this is a multiplayer game too and the option pops up to resurrect your party member in maps, but you can't interact with it.

Just a thought.