There's a singular very good reason to upgrade to 27 and any new version (at least when a .1 minor version is out and the kinds have been ironed): the whole ecosystem works better when you are on the latest stuff.

So unless you have legacy app needs, or need ultra stability for stuff like running a video shop or something, it makes sense to keep up, or at least don't fall more than 1-2 versions behind.

>They removed Rosetta and you have to reinstall that if you want it.

And they'll kill it entirely in a future version. It's been like 6 years for getting apps to Apple Silicon versions. And it's generally not ideal to run both AS and Intel programs if you can avoid it (wastes double the system lib memories, Intel misses some extra protections, etc).

>I switched to MacOS 3 years ago

OK, this explains it. So macOS is not like Windows where you can have even 15 years old version of the OS and programs still work forever.