When I tried Grimhammer it felt like they slapped bonus against infrantry/large to every single unit, made every building give a negative effect in addition to a positive one and overtune everything with stuff like the empire size mechanic. Oh and made morale basically irrelevant so trolls will stay in a fight as long as a dwarf unit. It kind of screams the kind of design philosophy where the dev thinks that giving the player a shitton of options makes the game more complex and deep. But what usually happens is if you think and math it out for a second, you realize that 3/4 of the given options are irrelevant in most scenarios you'll be facing.
The base game has a ton of issues, but stuff like the player ignoring half of the unit roster usually boils down to availability and relative cost effectiveness. Like a screaming skull catapult is a perfectly fine unit, but the build chain you get it from gives otherwise pretty crappy units so you don't feel like building it that often. And a unit like stormvermin has about as high upkeep cost as a rattling gun, but you'll get like tenfold value of the latter in the battlefield. If you made all the units available once settlement reaches a tier, but the hiring duration and recruit cost was inflated if you didn't build the specific production chain, it would encourage stuff like getting skirmishing cavalry more often. And if you gave out generic lords traits that made certain units have very cheap upkeep (like halving melee infantry upkeep for skaven warlords) it would encourage wider use of the roster in the campaign.
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