[Brian_K_White]

At both extreme opposite ends of the scale/funding/people spectrum we already have TempleOS and Fuscia, and probably countless in between. You tell me why they aren't going anywhere even though any properties you might say about one, the other has the opposite quality and is also going nowhere.

Maybe "unix-like" is really just a principle that has no expiration date, like "murder is wrong".

Depending on how slavishly you define "unix-like", for instance, I would not say that the principle philosophy dictates there shall always be a command named "rm" that takes these options and does this task a la posix specs.

But for today and certainly any forseeable time, it's perfectly useful to "merely" reimplement posix.