Earlier quoted context omitted.
"uncertain future of macos as it continues to be locked down" Citation Needed . Apple detractors LOVE to bring this idea up, but there's nothing to it in any real sense. Do Macs ship with a checkbox filled in that limits software vendors? Yes. This is a good thing. Is it trivial to change this setting? Also yes. Anyone who buys a Mac can run any software on it they like. There is no lockdown.
There is a lockdown as you cannot even boot linux anymore...
I don't care that I can't run Linux on my Mac. If I wanted to run Linux, I'd have different hardware.