Hello there.
I have two Intel Macs that, as good as Apple hardware is, still function very well. Unfortunately they have been discontinued by Apple on the software side, so I had to move them to other operating systems.
The oldest machine is a 27 inch iMac (late 2012), which has a 1TB HDD and 16GB RAM. Since this machine is from the office I can not really upgrade it (would love to put a SSD on it), aside from the RAM. Catalina was the last OS version I could use on it with Apple's blessing, back in 2019, but since it got old I tried Linux on it. For starters I tried Debian on the HDD but it was very slow, then I had the idea of using a USB external SSD drive and that worked better for a while, in fact I was able to put Ventura on it, but was unstable after all. The solution I came up with, which works very well (after solving some minor issues) is GhostBSD (it is based on FreeBSD 14.2): its default "Mate" desktop makes the luxury display shine again and the comprehensive software selection makes it very comfortable; the best and frankly unexpected thing, however, is that GhostBSD is installed on the HDD and runs extremely well (don't miss the SSD at all). I also like the fact that it is still a Unix system...
The other machine is a 2017 Macbook Air (the last with the luminous logo in the back), which last Apple supported OS was Monterey. I used it until Monterey lost the security updates (last year) and installed Debian 12 on it (GNOME based). It works really well, even faster than when I bought it new in 2020! The only thing that does not work is the webcam, which allegedly can be made to work, but I have not done that yet (not really interested).
Don't get me wrong though, I really like MacOS and still use it in a MBP, but don't like outdated/patched up software. When that MBP looses Apple support as well I might purchase a new Mac...
Thanks,
Joe.