Siri, maybe, but there's nothing about an FS or a programming language like Swift that makes them a "phone feature". Same for memory compression (which only exists on the Mac IIRC) and continuity (which would be useful even if it only worked from Mac to Mac).
If anything Apple has adamantly refused to "force phone features into a desktop", and only ports stuff that makes sense -- that's sort of what Microsoft did, trying to merge e.g. tablet and desktop platforms in the same UI.
>We were just fine without an app store. Just fine.
Well, I'm much much better WITH an app store. Why wouldn't I want one? I might want some more features out of the Mac App Store (like the ability to demo an app) but I very much want to have it.
And in no way is an app store a "mobile feature". App stores, (and app repos) existed way before they appeared on mobile phones, for one.