Whilst Ripley's suit was undeniably cool I just don't feel these warsuits are very 'grim dark'? Along with the hover-tanks they're a little too sci-fi, at least for the Imperium? Makes sense for things like Tau and Eldar who bring all the fancy tech, I thought the Imperium was all pretty wary of tech. Then again I'm so far behind in any of the lore/narrative that I dare say they do make sense in some capacity and I guess the world has to keep advancing, it can't stay the same indefinitely. I think it's the fact that they have stylized humanoid legs and arms that's throwing me off, not just mechanical ones, the Marines suit even has a massive pistol?...
I dunno, I guess if people like them they'll continue to be a thing, I think maybe I just don't go in for robots as extensions to existing limbs...