[threeseed]

> I'd first have to buy a new Mac for that

Which means you are running Mojave and your Mac is at least 6 years old.

I wouldn't expect anyone to support developers who are running a two generation old OS.

[kelnos]

I can run the latest version of my OS of choice on hardware twice that old.

This is only a problem that Apple has created to help them sell hardware. These days, a 6-year-old laptop is still a perfectly capable machine.

[threeseed]

And it is still a perfectly capable machine.

But you can't expect Apple to support it as a development platform. Especially when they want you to use the latest SDKs which only work on newer machines.

[tempodox]

You're moving the goal posts. I'm not interested in SDKs that cannot work on a given OS or CPU, I just want to update the compiler to make use of progress in the language, without being forced by Apple to buy new hardware for that, or install a different OS. You pretending these things cannot be separated looks deeply disingenuous.