My point was that there will never be a full “desktop mode” or even a good generic (supporting all apps) way of running apps on an external display. Right now you can develop apps that draw on an external display, but that has to be done on a per-app basis (there was a notable one a few years back that used “web apps” to build a “desktop” on the external display, but it’s not full, generic, zero code changes native app support).