Or sad. As a user and developer, 98% of the differences between these operating systems don't really matter to me at all. They only exist because of historical accident, desire for proprietary lock-out, or other pointless reasons like ego. For anyone who didn't believe it, they've finally gone and given a proof by construction.

We've abstracted over the CPU nicely. Without even thinking about it, my software will compile and run on any modern CPU just fine. Excellent! But it's dumb that we still have to learn about the specifics of the OS, just to write a simple application. I wish they'd just pick some kernel-level API, some common formats (filesystem, executables), some UI-level APIs, etc., and then everyone could just write to that.

(That's basically what the web is, except the API is in terms of HTML/CSS/JS, rather than CPU/RAM/disk/devices. You know you suck at standardization when you're getting lapped by the web standards committees. It's easier for me to cross-compile C to JS than to compile C on all the different platforms I use. What happened?)

It seems like every couple decades, a few companies get together to try to make a standard operating system (Multics, Taligent), and it always falls apart. We're just about due for another doomed effort!