glacially.
cause the warhammer universe has that kind of flexibility, and a lot of crazy stuff doesnt look out of place in wh40k. where as if you had some bright flashy stuff in ww2, it would definitely stand out and look out of place.
coh2 is already not a realistic game and it's not trying to be a realistic game (at least i hope not) in multiplayer. even 40k doesn't have the lore flexibility for dick decals or bright pink SM (chaos is different) it's tolerated in TT because it's TT and a big part of the appeal is that you can customize your army. you can do the same thing in realism focused WWII TT games, it's just less likely because the people who play those games tend to be more realism focused.