We just have too many debuffers in this game now. Skeletica's an autoproc debuffer, with fast energy recovery - removing buffs every 2s. That's why Mechtessa is hardly a hero anybody wants to spend $50 (or even $20 by this point) on, no matter how hard IGG is trying to make her look good in Squad Showdown. Heck, even the recent hero release, Dove Keeper removes buffs as well. Not to mention Sanctified Blast removing buffs as well. Even though Burning Plate makes SK an absolute beast when there aren't debuffers around, just one buff removal also removes SK's DMG multiplier, making Burning Plate no longer quite so powerful.
Only transformed heroes like GF and Anubis seem to keep their buffs, as they cannot be de-transformed. And Atlanticore's shield cannot be removed. What about other heroes whose buffs cannot be removed?? Skeletica? I don't have him, and am not exactly 100% sure about that.. it's hard to see in all of the mess with pets blocking the view of nearly everything lol.. I know that Demogorgon's shield can be removed because I've always killed him so easily with my Grimfiend in the past.