I've had an XDR for about a yer and a half now and feel that it is the right size. My secondary monitor is a 27" Thunderbolt and feels small.
The issue for me is I need a lot of monitors, multiple discreet and separate monitors. So right now I have 3 x 27". In the past I had 3 x 30" Cinema Displays and those barely fit my work area. I think 3 x 32" would just be too much. I could go down to 2 x 32" but I'd be less productive.
I just would really like a 27" with the specs of the XDR. I'd pay the same price for it.