One thing OCLP has done for me is give me an idea of what a current version of macOS would be like on a new mac in relation to existing software and workflows I do daily, or enjoy occasionally. For daily tasks like email, web, etc I'd be OK, even the stuff that works on supported Macs like the graphics stuff. It's more about backward compatibility and rare stuff I've had questions about. So, I'd rather find that out first without dumping a bunch of money into a new machine and then having something happen to the colder computer with no way to go back, and being stuck with the new mac and new arch. I can tell you, from my testing, Monterey still does 95% of what I need and it's the latest supported OS for this late 2015 iMac. Second in supported Operating system, Mojave can still run maybe about 90% of my stuff, even if it's one or 2 versions old, and still offers 32 bit support for games and older apps not updated for 64-bit only. Then I have Linux on an external drive for stuff that macOS just doesn't do well at. And then I have two installs of operating systems that use Open Core to boot. All the macOS installs are on the internal Fusion Drive via APFS Volumes.
For the Record, Firefox ESR still supports Mojave so it might not have the latest features, but it's patched for security.
I've always enjoyed older computers but also like staying current enough to still do the current stuff I need as well.
