Thing is, Scrotie, that even WITHOUT invisibility I consider stealing to be way too easy.
Maybe I'm just crazy, but I don't think that a couple warriors clanking around in full plate, with 0 points in Stealth or Pickpocket or Lockpick should be able to steal everything of value from the Mayor's home. And then, with no investment in Charisma or Barting, sell all of that gold-plated dinnerware and stacks of paintings to a merchant who doesn't find it the least bit strange that a couple grizzled adventurers just happened to be carrying around the contents of a mansion.
I literally just don't think that should be possible in this game.
If you want to build a character who can do all of that, fine. I'm all for it. But you should have to earn it. Your character SHOULD have to actually be good at sneaking in order to steal while standing right next to an npc. Your character SHOULD find it challenging to sell things which are obviously someone else's property. Your character SHOULDN'T be able to find keys to storerooms and treasure chests lying around on the ground, where anybody can pick them up.
I agree that invisibility is a related problem, but you don't even need to use it to be a master thief in this game.
