Well it's the newest dungeon so the bosses have a lot of health. This is to make getting the title / emblem an actual flex and not something everyone can do. It's a reward for the most dedicated players in the pve community. Which I think is actually really healthy for the game and thank you bungie team! Gotta have rewards for more casual players and have to make hard to achieve rewards for hardcore players. Hardcore players make up the minority of players which also explains the poll. There's also a bias for people that think the bosses have too much hp to search the internet and find this post. That aside there is a glimmer of hope for more casual players though. The previously released dungeon bosses seem to have less hp after a new dungeon releases. For example SOTWs final boss has way less hp than it did when it first came out in Season 19. When it first came out it had about 12 million hp I wanna say. But now in Season 21 it only has about 7 million health. It used to take me about 10 phases on solo flawless to kill the final boss. I just did it again today with a suboptimal loadout and did it in 5 phases and almost 4 phased the harpy boss. In conclusion I think it is actually a good thing the bosses have tons of hp on release. This gives the hardcore players something to grind for. While also having the boss health lower for older dungeons that way other players can get that cool emblem too.