The one vs two door tent is definitely a matter of personal preference.
Exactly, it is a preference, not a need. I don't think anyone said an extra door or a vestibule or two were a bad thing, merely that they weren't a necessity. Someone certainly can prefer two of each.
I am sure how much difference multiple doors make depends on the design of the tent. None of the tents I used ever required us to climb over each other. A single side door might require more climbing over and make a second door more desirable. Our's all had a end door either at our heads or our feet. With some cafe we were generally able to climb in or out without waking each other. I have never shared a tent with a side door (other than with my dog).
On the subject of vestibules, none of us on my tours were inclined to bring in much gear. It mostly stayed on our bikes. The tents I shared on tours had exactly zero vestibules and I didn't miss them.