I would love for exe to lose their defence. Exe right now is too powerful. And yes, it is fun to sow chaos after you've won, but to that I say, change your strategy. If you are saying your target is sus n1, and then get mad at the fact that you get show by vig because you lost your defence after your target got hung, maybe don't do that strat? Get your target hung naturally or by softpushing them to sow chaos. Usually a smart jailor will execute you anyway regardless of defence.
In Ranked exe has a lot of power late-game. If it gets to a 1v1v1 with SK, GF or Exe, SK can't do anything to ensure their win except have exe vote the GF. They can even force an exe-only win when that happens (unless mafia/sk vote the exe up).
Or, the most broken aspect of exe, an exe that works with town after they won. This usually doesn't happen in my ranked games, but I see it often in ranked practice. And yes, evils can claim exe too, but evils can't kill the exe working with town. I once worked with town as exe and was hit thrice by mafia. Looking back on it I saw how broken that actually was. Trans just kept using me as a meatshield for town and I agreed to it. I think if mafia/sk/other evils can kill exe after they've won, it balances out a lot.
I also disagree with saying it "nerfes" exe. Exe already won. You don't "nerf" their win-condition. You may buff town with it, but you'll also buff evils. I think with the forger/disguiser changes that are going to happen, exe losing their defence really gives it more strategy and removes kingmaker situations. If you disguise as an exe and get killed by vig, well... you can just say "I already won!".