We have a couple of friends who will not use the "facilities" in their RV.
The 1st one bought their TT used and the previous owner had pyramided the black tank so they are leary to put anything but #1 in it. Paper goes in a bag for the dumpster.
The 2nd won't use the shower because they are afraid if they use it the shower stall it may leak. Third TT and still won't use the shower.
We bought ours because we did not want to use public facilities. Probably why I have 1.5 baths.
Dumping and flushing is no big deal but some act as if the world will end if they have to dump a tank.
Have met several people who use the shower for a pet's bed or storage. Seeing the size of some showers I guess I understand but I would not buy a RV with a restroom that was not functional and comfortable to use.