I mean upon connecting the two machines they should became one. Whatever the phone can do now the PC can do and vice versa. I could use the fingerprint reader for authenticating just like on the phone. Or extend the screen to the phone screen, etc-etc.
But more importantly it should be trivial from the user's perspective. I understand almost all of it is possible somehow but imho it shouldn't be kde specific feature.
And please don't take it personally, I'm glad it works for you it's just an ongoing rant from my side.