[acdha]

I’ve been comfortable upgrading on day one for a couple decades, and have never had a problem. The difference in most cases is the areas where Apple doesn’t control – I don’t use a lot of third-party extensions but a lot of apps, even popular ones like Dropbox, used to do pretty invasive things which were prone to breaking. People in industries like audio production where much of the software has DRM systems have decades of scar tissue from that kind of stuff, so I totally understand why they hesitate.