Some of the voiced concerns really are an issue of improperly constructed wetrooms, more than the wetrooms themselves. My floor definitely does NOT stay wet. Anytime you build a shower, the floor is supposed to slope (invisibly to the eye) towards the drain. This is doubly important when building a curbless shower, which is obviously what you have in a wet room. And when building a wet room, the whole room itself is essentially one big shower, so the ENTIRE floor needs to slope toward the drain.
And a GOOD fan makes a huge difference. There are plenty of crummy fans out there that do little but make noise. And plenty of contractors who don't even install fans! But a good fan will remove the humidity left in the air from a shower, which, when there is a shower curtain, is all that is causing the damp toilet paper. Just be sure the vent is venting the moisture outside the house, and not redirecting it to elsewhere in the house. Our contractor strongly prefers Panasonic fans.