By reconnecting it to the keyboard, you unlock its full creative power in a pen first mode.
Hmm... what does the keyboard contain? Are we looking at another dual-processor hybrid? Or perhaps only dual-graphics? Or even simpler, does the keyboard have most of the battery and so the screen aggressively throttles itself when undocked?
Well, the photo with that caption is with the keyboard folded fully over backwards used as a pseudo-tablet. No keyboard use in that case, and probably no IO either.
Sure, but it seems like if they wanted to be able to connect USB devices while the Book is in a tablet mode, they would simply put USB ports on the screen instead of engineering a fancy reversible hinge. Ports just don't seem like the killer reason to offer that mode.
Usually the keyboard-folded-back mode is offered in lieu of a detachable screen.
It seems to me that once they've built a detachable screen, making it reversible is simple: you just make the data connector reversible, OR you put the data connector offset and build two of them on the keyboard side, so the screen plugs into one or the other depending on orientation. Either way, pretty cheap. There is no "fancy reversible hinge"; the fancy is in the detachability.
What do you get for that? Battery, IO, and GPU.
If you want to put USB ports on the screen, that limits the thinness of the screen (SBook screen: 7.7mm. SPro4: 8.5mm, which they allege was limited by USB ports).
Hmm... what does the keyboard contain? Are we looking at another dual-processor hybrid? Or perhaps only dual-graphics? Or even simpler, does the keyboard have most of the battery and so the screen aggressively throttles itself when undocked?