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No, they do so much more. For example with KDE activities you can save states of your desktop (which apps are open, their position on screen, their open tabs, files etc) and restore them whenever you want. So you have ready layouts for your usual tasks and you can start/stop or switch between them in seconds. Another small example that exists since KDE 2 maybe: you get a clipboard with history. How one may live witho…
Does KDE do these? It sounds like the setup you describe is only possible with a huge amount of configuration. With enough configuration, Emacs could do all those things too.
The only one it doesn't do by default is the Android integration but you only need to install kde-connect and pair your phone. Kde-connect will probably be part of the default installation in the near future, so it will be out of the box too.
KDE always had such cool features. For example when audio CDs were still a thing, whenever you inserted an audio CD in your drive and open it in KDE's file manager it would show you folders with mp3 and flac versions of the songs. Once you tried to copy them, KDE would rip and encode them on the fly for you!