>>logic_+(OP)
Taking better advantage of a display is nice but imo the really exciting part of desktop mode is the planned integration with Google's Linux Terminal app (i.e. 1st party linux VM support). I have a Samsung DeX device and while you can get a basic dev environment working easily it can be really cumbersome to make it comfortable to use and integrate with your normal tablet workflow. Being able to install full-fat linux apps and run them in a window would be a complete game changer.
>>chneu+4A
Last I used it, I still wouldn't want to write code on Dex. But it was great for everything else. I could definitely complete just about any other tasks I needed with it. It was a little clunky, but doable; teams calls, getting into internal tools for triaging systems issues, the company CRM, all that stuff.