OP,
Yes, sorry… I completely misread your initial comments. My bad. I can tell you from my point of view that mono does not hold my interest…. for a second. I have a number of well recorded mono albums… I generally cannot get through two cuts. Admittedly I am using two speakers.
On the other hand I know more than one person who are completely fine with it. I have no grand sweeping conclusions, other than stereo is absolutely essential for my enjoyment and three too many.