A proper desktop mode, ie one that can run full desktop programs as-is would be, for me, the holy grail of mobile devices. And frankly that would be the only reason to buy an "ubuntu" phone, otherwise I don't see it having any competitive advantages over its competitors at this point in time. With all the hardware capabilities in a modern phone, it's just wasted in only running a "mobile" OS. Give it decent onboard storage (64GB at least), one or two microSD slots and it's more powerful than many entry level notebooks.