[lapcat]

> In my experience it is not very long before an update nails MacOS software if you don't actively maintain it.

That's not my experience.

Of course the removal of 32-bit support in macOS Catalina was a killer, but otherwise I regularly use a number of older apps.

Here's a notable example: via Rosetta, I'm still using the preference pane RCDefaultApp 2.1, which was last updated in 2009. It still works 14 years later! https://rubicode.com/Software/RCDefaultApp/index.html#versio...

[jimnotgym]

I think it very much depends what bits of the OS you are working with. I had an application I had a part in maintaining get nailed repeatedly by each generation of Apple Silicon and OS updates. It was working quite close to hardware though