Re: Not unprecedented.
I think you will agree that removal of a power port is unprecedented.
... and no.
Perhaps true when speaking about laptops, though tablets and phones (including Apple's own) have used a single port for power and data connections for some time. Android devices with micro-USB can use the port as a charging port, HDMI/Video out, mass storage and HID via USB OTG. To a lesser extent Apple's lightning conector allows similar (without the mass storage options, not sure about HID devices).
If you think of the MacBook as a laptop, then IMO it's very restricted as I still make use of DVD's, SD cards, USB storage etc. However if (as some have already commented) it's looked at as more like a tablet with an attached keyboard, it's no more restricted that most of the other products on the market.