i guess i should've checked WoJ first on what he thinks Mab is like before i posted my first post, but here's part of itand this is probably related
For reference:
On the other hand it makes me consider that I can't really think of any literal reason why Mab is considered villainous
Emphasis added. I don't think why Mab does what she does or the stakes stops many from seeing Mab as villainous. Here's the Webster's definition of villian:
1: a character in a story or play who opposes the hero
2: a deliberate scoundrel or criminal
3: one blamed for a particular evil or difficulty
Mab fits one and three pretty well. Arguments can be made for two. Google's definition, "(in a film, novel, or play) a character whose evil actions or motives are important to the plot," make it easier to argue that Mab isn't a villain because her motives aren't evil and her actions arguably aren't either. One can argue that evil requires agency. Mab may not have any agency left. On the other hand, plenty of people think of pretty much every misfortune as evil. And on the third hand, it's easy to argue that the Faerie Queens have much more agency than we thought early on in the series.
Whether necessary or not, Mab's done a lot of terrible things.
So I don't think it was error in the least to not worry about that WoJ when posing your question.