Many asked for tabs in every app, shared clipboard, more voice control, improved Photos app and better iTunes, picture in picture, and more full featured Messages app. Plus few would ask Apple to take back the ability to save space (up to tens of GB) through iCloud/Desktop integration and more.
In the meantime, there's also a new filesystem on the way, already in early public developer versions.
>and there's a ton of nonsense none of us will ever use, as the Mac platform gets increasingly complex
Like? I can't possible thing anything that got made more complex, save for a couple of trivial things (with an equal amount of other stuff or more becoming easier).
>moves away from Unix compatability
In what way it had moved one iota from Unix compatibility?
>and doesn't do anything useful with this additional complexity
What complexity? What exactly did you find more complex compared to 10.10, or 10.7 or 10.5 or whatever?
Besides something like "sandboxed apps make it difficult to piss all over the filesystem, like old apps could".