This is one of the real problems: Apple knows that a significant chunk of desktop/laptop users are iOS devs, and while they started to use Xcode as a carrot, it’s now very clearly a warship-mounted harpoon, dragging everyone along in to waters infested with piranha (biting in to freedom of speech, ability to use 3rd party tools, ability to hack away at the hardware of our choice, and many others).
I just see no reason to upgrade the OS to the version that dropped 32-bit support. High Sierra runs everything and feels great.