The general population only need to run a browser on their external monitor, with Office 365 or Google Docs and Gmail. There is no need for anything else. If one is not a software developer, which Linux apps do you feel are needed?
I used Samsung DEX a few times on my tablet. The mouse plus touchscreen combination works well. The keyboard is a little worse because there is no Esc key on Android and Ctrl [ is uncomfortable.
Gimp/Krita, FreeCAD, more and more games, Inkscape, Ardour, Audacity, Calibre, Sound Converter, Converseen, PrusaSlicer, etc, plus all the other stuff that people would probably discover.
If one IS a software developer of course, then you probably need a lot of Linux apps, and it would be cool to have them alongside a platform that's way more reliable than Linux, so that your browser and email and calendar and music are always there and don't bog down.
I used Samsung DEX a few times on my tablet. The mouse plus touchscreen combination works well. The keyboard is a little worse because there is no Esc key on Android and Ctrl [ is uncomfortable.