The dozens and dozens of simulators it installs without asking... which kill your system's audio capabilities for some reason: https://discussions.apple.com/thread/256140785

But the best part is what it DOESN'T install when you think you've updated. You get on a plane and settle in for some work, only to be prompted to download and install a bunch of required crap you weren't told about. OH WELL, says Apple, your time is FREE!