The mantra is, and has always been that the MRTT doesn't need a cargo door because it retains all of its cargo capacity in the undefloor hold.
Yes of course. And when it's pointed out that a customer (like USAF) says they need more "cargo capacity" in terms of mass and/or dimensions (including length and height) than will fit in a lower cargo hold the answer from those chanting the mantra has consistently been what amounts to "but that's not needed."
As for not reading 2 thru 4, that's your business. (and one could argue, your loss.)