Back in 2011 the Atrix could support a desktop mode with a dock, but not simply by plugging in a USB cable.
There was also a Motorola Ready mode which I experienced briefly on a Moto G that I bought but returned because the screen was horrid mush! (Not all Moto G, some had nice screens, but that particular one was a lower resolution, slow LCD screen with a lot of ghosting.)
But if I remember, Ready isn't really a standalone thing. It's more like what Microsoft Phone Link does - e.g. running your phone "desktop" but on another computer. But I think I'm remembering wrong... so maybe newer ones are a bit more like this - https://www.tomsguide.com/news/i-spent-a-few-days-with-motor...
There was also a Motorola Ready mode which I experienced briefly on a Moto G that I bought but returned because the screen was horrid mush! (Not all Moto G, some had nice screens, but that particular one was a lower resolution, slow LCD screen with a lot of ghosting.)
But if I remember, Ready isn't really a standalone thing. It's more like what Microsoft Phone Link does - e.g. running your phone "desktop" but on another computer. But I think I'm remembering wrong... so maybe newer ones are a bit more like this - https://www.tomsguide.com/news/i-spent-a-few-days-with-motor...