If Mighty Doom has more interesting ideas with enemies, maybe that could justify the spirit or Buff Totem, so instead of speed or damage value, maybe a few more projectiles.
But actually altering attacks could have even more of a change in gameplay, so making them level exclusive is still a safer choice.
I feel like how interesting an enemy can be in MetaDoom can depend on: if the new ideas seem too gameplay altering on certain mapsets (hence why the Cybermanc shoots slime bombs instead of something like the player's gas grenade) vs if the series doesn't have enough material, so you have to be creative. (like the Cacodemon from D64/Malwrath shooting 3 fireballs as a unique attack)
Maybe someday, there will be a Doom game where id just makes up a bunch of enemies just to create a bunch of weird attack ideas and that sort of canonizes most of the ideas people had in mods.
While at it, in case my memory isn't failing me, i remember seeing these Bruiser sprites
https://www.doomworld.com/forum/topic/7 ... nt-2075880 which seem like an upgrade from some that were either posted here or in the Reincarnation of Evil thread.
Because not only does it have the Bruiser's more pointy horns, it even has an eye in the screen, which is something that occured at times in RoE.
Speaking of sprites, Craneo's computer was fixed and he reinstalled the same programs he used to make sprites, so there's a chance he might return to his Eternal monster sprites.