Now that my MacBook Pro no longer receives the latest OS updates I was wondering what to do with it. Should I keep the 'aged' but working macOS or try Linux?
It would be great if there was something like Asahi Linux but for Intel macs. When I tried distros in the past I had limited success as there was always at least one component that was not supported (like Wifi or sound).
You can, however, keep the machine running unsupported newer version of macOS. That's what OpenCore Legacy Patcher does - it patches a newer macOS to recognise and run on an older Mac. YMMV, of course, and there will be a point when there are no Intel versions of macOS whatsoever.