Are folks not using migration assistant when they get a new Mac? I’ve had the “same” macOS install for almost 20 years, across 6 or 7 machines, and it’s fine. I see the value of nix-darwin if you use multiple Macs and change them frequently, but that’s never been me.
Right, these commercial operating systems are designed with a different philosophy that arguably has its own merit.
I’m enjoying a Fedora atomic distribution for the eliminating the Linux upgrading issues of the past. But macOS and Windows never really had that problem.