I just looked at the dimensions, and it's basically the same just slightly taller than the 8+ I have now, and the same height as the OnePlus 8T I also have. So as you said, there's not going to be any issueI have the 11 Pro Max. Fits in jeans and shorts pockets, fits in cup holders. No idea why there's an issue on your end with that.
Anyway, no - not getting the 13PM. Not getting any phone actually. We just got our 11PMs in February. Got about a year and a half on EIP before they are paid off.