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@neil I looked at this as Samsung DEX is deprecated on macOS and I recently reactivated my 2010 era desktop and am running #Fedora and #KDE on it. The macOS client is buggy, but that's OK, it's beta.
I'm going to try the Linux client tomorrow. I don't see a plugin to show the whole phone screen and run apps like DEX does, but maybe I don't need that. For free software working across a wide variety of OS and platforms it seems pretty stonking at first glance.