OS X is real certified Unix. What can’t you do with OS X that you could do with Linux?
* run containers natively
* customize / swap out the window manager/display manager
* run kvm virtual machines
* desktop fractional scaling
Not needing to pay the licensing fees for vmware, parallells
Not needing to use a buggier hypervisor/manager such as virtualbox
Leverage qemu and all of it's benefits at full speed, such as emulating ARM devices
So you’re okay with paying at least $800 for the cheapest Mac that Apple sells, but my development Mac would at least be $1100 - $2000, but you don’t want to spend $79 on Parallel Fusion?
There is also the integrated Hypervisor.framework that seems to be gaining traction and I fully welcome that! But it's still not kvm: https://developer.apple.com/documentation/hypervisor
Admittedly I stopped looking into it and just shelfed the laptop until requesting a saner one.
But more to the point. Even if you didn’t know about that option you gave up because you didn’t want to sign up for a free account?