The Daemonhosts we fight are kinda on the weak side, aren't they?
I've heard talk about Daemonhosts' power before, but after playing another new 40k game we can't really directly post about right now, it kind of casts the ones we face in a new light.
In the Vox Liberatis mission in that other game, you face a Daemonhost possessed by a Lord of Change, and it's able to cast some pretty insane spells at the Astartes and is only really killable by destroying several artifacts that are spread around the final arena. On top of that, it's got tons and tons of Tzaangors, Thousand Sons, and Chaos Cultists to defend itself with.
Compared to that, the Daemonhosts we fight are pretty passive, only really do some melee attacks, and are totally killable by the average preacher with a Thunder Hammer. It's also just chilling somewhere in the level, and is totally avoidable if the team knows to stay away, and not shoot it.
It's not to say that Darktide's DH should be stronger, but lore-wise, we must definitely have gotten ones from the weaker end of the spectrum, I guess.