Illithids seem more like monstrous humanoids to me. I think anthropomorphs should be humanoids. If they have magical abilities or are somehow very distinguishable due to cultural doohickeys or the like is when they should cross over to monstrous humanoid. Minotaur... hmmm, I guess that works as a monstrous humanoid because when you think of a minotaur you don't really think of an anthropomorphic bull. Same with illithid. Lizardfolk you do however, so that makes sense. It's very complicated, I think.