Correct, only one person needs to draw.
The hard thing with digital is the spatial aspect. I like a big canvas to write on as opposed to the feeling of being confined to a screen. Note that even if the screen increased, it still is more cumbersome. I still use digital drawing programs for creating artwork so I’m not opposed to using a digital medium for drawing.
The other aspect is it allows you to step away from screens altogether and approach a problem in a more tangible way. I like standing in front of a whiteboard and taking in the flow if data or mockup and tweaking. In these instances, I’m not sharing my camera, it is purely a thought process for myself.