It's a fact that Apple has continuously moved to lock down macOS in ways that are antithetical to folks that want full control over their operating system. To many of us that moved on from Linux on the desktop, the combination of a stable/uniform/attractive desktop environment with a Unix core that had great developer documentation -no longer the case!- and nicely-designed APIs was too much to resist. Unfortunately, the push towards consumers and Apple's increasingly one-sided my-way-or-the-highway approach (fueled by security concerns that to me are completely irrelevant, if not a huge annoyance and waste of time) means that a lot of us oldschool Unix hackers were left out in the cold.
I don't plan to upgrade past Mojave and at some point in the future I will move back to Linux.