Slaanesh and Nurgle: tarpit enemy, swarm flanks, rout and repeat.
Vampire Coast and Wood Elves: melee chaff in front, gun lines behind, rout and repeat.
With such an overly generalized statement, you are really just arguing that a game with RTS battles plays like a game with RTS battles.
Or that a Total War game plays like a Total War game.
Congratulations, you've discovered a genre.
You are also entirely wrong about that playstyle with Wood Elves - I mean, I guess you
could play like that, but why gimp yourself and then claim it's the game's fault?
Generally, at this point in the game's lifecycle almost every faction has access to so many different units that yes, you
can play every faction more or less the same.
But A) that's
your choice to make the same army composition each time, don't put it on the game and B) some factions will be drastically better at one playstyle than another.
I honestly don't know how you'd expect a game called Total War: Warhammer 3 to play that would be drastically different from the game that is there.
Gladius has 12 factions and all play differently, so it's possible.
You have to be shitting me.
That's a turn-based game, with entirely different scale, gameplay, setting, requirements for putting in new things and drastically lower production values. Turn-based strategy is swarming the market for a reason - it's significantly easier to implement than its realtime cousin.
Of course it can go further in gameplay diversity between factions.
You are comparing apples and beef steaks.
I mean, criticize away, the game has more than enough points to do it with, but in a way that makes sense and isn't just shitting your pants in blind anger.
Unit caps do less than one would expect because you've already won by the time they kick in anyway.
Uhm... What? Army unit caps (at least the ones in SFO and that mod that does the same thing for vanilla) give you unlimited green, 10 blue, 5 purple slots. Some units require two slots.
I've maxed out blue in armies in turn 20-30 and faced similarly tiered armies. I don't know about you, but I haven't won the game by that time
Nor have I won the game by the time I can get all purple slots filled in armies (though that's closer, of course). Even fully maxed out, you'll still have about 1/3rd filled with low tier units - unless you cheese with hero stacking.
Even late game, it makes doom stacks basically impossible (or absurdly impractical) and evens the playing field
a lot.