I'm not the person you replied to but I've used hackintoshes since the Snow Leopard days. Generally if you set it up properly as was described at the beginning of this thread minor updates will work fine without any user input. Some major updates will be the same, with others you might end up needing to change some kexts to fix audio or wifi but it'll generally boot. With major updates that change a lot you might be better off backing up your data and doing a fresh install.
So far all versions have become hackable (generally in a matter of days or weeks) but with Apple's transition to their own silicon I imagine the last version they put out that supports x86_64 will be the final hackintoshable build.
I anticipate that ARM macOS will not run at all on systems without Apple Silicon (as they are calling it) and never will. I assume these systems will have the proprietary secure enclave on-die, which would be missing from all other ARM systems.
I agree. No one has ever managed to get iOS on non-Apple hardware†, and I don't see why ARM macOS would be any different.
† Except maybe Correllium, which was a large commercial effort. Since they don't make any details public, I'm not clear if Correllium just built a sort of emulator or if they actually have the OS running "natively" on 3rd party hardware.
The Darwin on ARM Project[1] attempted just that. It depends on what you mean by "iOS" if you want to say they accomplished it - for example, they got XNU, the kernel, running on a Nokia N900, but they never got a UI up and running (only single-user mode).
So far all versions have become hackable (generally in a matter of days or weeks) but with Apple's transition to their own silicon I imagine the last version they put out that supports x86_64 will be the final hackintoshable build.