Zardnaar
Legend
I fugred out my own explanation why bosses die too easily.
Because there is no scenario in which focusing fire on the boss is not the optimal strategy.
What's the best solution to fight involving serious enviromental hazard? Focus fire on the boss so he won't punch you while you avoid the hazard.
Ticking clock to some big thing? Focus fire on the boss because they're either crucial to the ticking clock going off or the thing preventing you from stopping it.
Minions? Focus fire on the boss, who is more dangerous, you can round up small fry later.
Hostages? Focus fire on the boss before he gives order to get them killed.
boss uses trickery and disappearances or shifting enviroment to stay out of sight? Every time they are in sight....focus fire on the boss.
And this is not an issue that can be fixed in this game, not by people designing adventure modules. Because the only solution I found to not have PCs focus fire is to have at least one player have a personally tailored incentive to do something else, one drawing from their character's backstory and motivation. That is the only way to keep players away from optimal strategy of focusing fire on the boss.
Encounter design. Some bosses don't deal that much damage.
Say they have 10 low CR mooks. Archers perhaps. 2 or 3 attacks each maybe hunters mark
That's a lot of damage incoming vs some bosses.