No one has mentioned the possibility of using UCB-C as a docking station. Phones are already powerful enough for the kind of work an executive does (email, word processing, spreadsheet). Now if their computer is in their pocket and they can plug into any screen at all they don't need a computer at all.
The progression of the smartphone is evidently to replace the personal computer and the iPhone X should be a step in that direction.
I think the iPad pro is more targeted for the kind of work that an executive does. Docking stations / plugging into any screens don't seem like something that has been well thought out and I don't think that Apple's strategy right now is to market to that kind of audience.
The progression of the smartphone is evidently to replace the personal computer and the iPhone X should be a step in that direction.