If the wet bath is built correctly, it can be a joy to have the extra room and an always clean bath. Maybe the RV designers need to look at more sailboats...
I had a wet bath on my sailboat that I showered aboard every day for over 10 year in the Caribbean at numerous anchorages. The shower head was part of a retractable sink faucet, so it stowed away neatly and doubled as a sink faucet. After my shower, I wiped the bathroom down from ceiling to floor, then lastly removed the floor grate, then wiped up the floor (hair) underneath. My bathroom was always clean and spotless, something I did enjoy. I had an opening hatch above to air it out. The door was a bifold door that could be folded in half then locked "open" to further aid in air-drying the bath to prevent mildew.
Because the shower was handheld, I didn't really have a huge mess. With a handheld shower, you can aim it very close and right at the exact body part(s) you are cleaning. It's a bathing technique very different than just getting in a shower and standing around while water from overhead splashes around randomly.
Because I was using water from the rain catcher (I wasn't plugged into a marina) I took water saving steps, which also lessened the mess. I would use the handheld shower to carefully wet down my body (aim it close to the body parts!) then I would soak a wash cloth and turn the water off. I would use soap to lather up the wash cloth and scrub the body, then turn the handheld back on, to rinse off the body.
You may be shocked to find out that hair does not need to be washed each and everyday to look great. I wore a shower cap over my long hair and only washed it about every 5 days unless it was salt encrusted (from sailing).
Ironically my bathroom was built of teak. About once a month, I would make sure the bathroom was super dry and completely aired out, then I would oil the teak with Old English Furniture Oil. This built up over time so that the water was repelled and not really sticking to the wood. It also kept the wood looking fantastic.
On another yacht where I worked, in the crew quarters our wet bath was floor to ceiling mirrors. We just used a squeegee to clean after every shower, so the bath always looked clean for the next user.
Now that we have microfiber towels which you can get small ones by the dozen, they make a great cleanup and drying cloth. First mop up all hair with a paper towel, then use the microfiber cloth to dry the bath.
In other sailboats I worked aboard, the bathrooms were often once piece molded fiberglass, this made cleaning up after a shower fast and quick.
If RV designers would make a one piece fiberglass molded wet bath, we could enjoy much larger bathrooms (in smaller RV's) as well as a larger (wet) shower. My current RV has a broom closet for the toilet and sink with a shower across the center aisle. Luckily the door arrangement is such you can "connect" the shower area to the broom closet and have a temporary large bathroom while showering in private. But if I had a choice to combine the shower stall and the broom closet on one side of the RV as a larger wet bath, I would much prefer that over the smaller shower stall and broom closet. I would want a self draining removable grate(s) in the floor so it would drain and dry easily.
But... RV designers don't look at sailboats and they surely don't listen to folks like me. LOL!
If a wet bath means a larger floor plan, I would surely want the wet bath. Showering is only 1-5 minutes if all you want to do is get clean and get on with life.
Living in smaller RV's is not going to be identical to stick and brick housing. There are compromises and trade-offs, but if you love the freedom of traveling to beautiful places, learning to do mundane things differently is well worth the effort.