The technology is still too immature. Mobile apps aren't designed for desktop UIs, so mobile apps thrown up on a desktop monitor are going to suck. Desktop apps

The technology is still too immature. Mobile apps aren't designed for desktop UIs, so mobile apps thrown up on a desktop monitor are going to suck. Desktop apps are usually compiled for x86 and not ARM, so you can't run desktop apps within a desktop environment that's thrown up on a monitor by your phone. Microsoft has been trying to throw Windows onto ARM for a long time, to no commercial success, because the entire value proposition is the enormous back catalog of Win32 applications which will never run performantly on ARM. So the best bet is Linux leading the change, with Linux on ARM powering desktops and driving demand for desktop apps to be compiled to ARM - but yeah, not going to happen any time soon.