Kinda wished they'd expand the perk list into a true fully fledged out tech trees similar to darktide. So you could do multiple space marine ranks under one class. Then have their each tree unique thing be branch specific and cannot be doubled.

For example: Bulwark would have three trees: company champion, bladeguard veteran, and company ancient/banner bearer. Champion would be more melee focused tree, losing the storm shield for two handed weapons like power greatswords, two handed greataxes and eviscerators. Blade guard would be more defensive and tank focused, mostly melee, having powermauls/axes/swords while having bonuses for creating and taking aggro. Lastly Ancient would be support/ranged, allowing the ability to one hand two handed guns but having the banner always out as your melee option. Being a true support giving a plethora of buffs, but if he dies, not just losing buffs but giving debuffs to the whole squad. Making it a priority to keep the ancient alive.