just mark the stealth with a fire winding argument.. spies have much lower resist compared to tanks, and is the primary reason they are able to be able to stand up against one. I don't think OP fights should go back to just Tanks and PPUs, also like chazz said, tss is a thing..
and no, I don't play spy.. I am almost always a PPU or a dev tank. I just don't think destroying their survivability option is a good idea, I like variety.