The way I see it, "desktop-dependent workflows" overlap more and more with those "Windows-dependent workflows". Nowadays, most people don't need more than a web browser, and in that sense they do just fine with a tablet or phone (where iOS and Android dominate, and GNU/Linux is not really a viable option, at least not yet), or a Chromebook (yes, it's Linux, but it's mainly just Chrome).
Most people I know with a legitimate use for a desktop also have legitimate reasons to use Windows or macOS: gaming on Windows, content creation on Windows or macOS (graphics designing, video editing, ...), and MS Office lock-in. The only exception I can think of are developers, but even then, depending on the kind of development one is doing, using Windows or macOS may be the only choice.
Most people I know with a legitimate use for a desktop also have legitimate reasons to use Windows or macOS: gaming on Windows, content creation on Windows or macOS (graphics designing, video editing, ...), and MS Office lock-in. The only exception I can think of are developers, but even then, depending on the kind of development one is doing, using Windows or macOS may be the only choice.