So renting an accessible room compared to a standard room- the accessible rooms come with a large wetroom style bathroom, making them ideal for messy play since all the gunge can be contained in the bathroom and everything in there is water-resistant so we can sling the stuff about a lot more, as well as more space for cleaning out the pool etc.

However these rooms (as the name applies) are designed and intended for people with disabilities (such as wheelchair users) who'll find it difficult/impossible to use a standard room.
(for clarity myself and my partner have no physical/medical reason to use such a room- this is purely for messy fun)

Booking in off-peak weekdays (not in school holidays and no major events on nearby) and hotel chains usually have several accessible rooms in each location so the chances of us taking up a room that's genuinely needed are pretty small.

I've seen accessible rooms mentioned once or twice on here before, is this a regular practice for some of us or something thats totally frowned upon?

I can see why people do it and wouldn't judge anyone for it but if you don't have any physical disability it's honestly not needed.

I realised this on one of my tours and so I wrote a huge guide to having massive sessions in hotels here... and the bathroom isn't needed at all except for getting yourself clean https://www.spotlesssploshing.com/post/how-to-prepare-and-clean-up-wam-sploshing-sessions-in-a-hotel-room

It's easy to make enough room and to clean up if you have the right stuff with you, which might not even be much depending on the size of your session, but it's still not a problem even with tons of stuff.

I hope to be able to give people enough confidence to ditch accessible rooms and make the most of the main floor space. It's honestly the best time

I would say go for it if you're doing it off-peak. Plan ahead and avoid local events too.

There may be a small chance you'll be blocking someone in greater need from getting it but that's probably quite slim mid-week. Equally there is I guess a chance that they would sell out (to the more needy) anyway when busy leaving people in the same situation.

Another way to look at it is that if there is increased demand then hopefully hotels will build more!

I've booked accessible rooms before for other reasons (wanting a ground floor room to bring stuff in for security) and I'm sure there are other reasons people would have requested such a room too.

As mentioned above, the more demand thete is, the more such rooms will be provided so to an extent you can even see using them for WAM as a good thing if it means more disabled-friendly facilities are provided overall.

However this idea that only disabled rooms should have wetrooms needs to die. In Europe, its relatively common to have wetroom bathrooms in just ordinary hotel rooms, minus all the extra grab-rails and high contrast signage you get in a "disabled" room. I stayed in a hotel in Stockholm once that had a beautiful dark-grey tiled wetroom bathroom, would have been perfect to shoot scenes in. And wasn't a disabled/accessible room, just an ordinary one. Huge modern hotel directly above the main railway station.

Very good point.
I'd love more wetrooms in general, it's either stepping/slipping in the bath or a pokey little cubical every time I want to shower. And the bathtubs are tiny so I don't actually fit in them properly.
It's just every hotel I've looked at the only wetrooms are in the accessible ones.

+1 to both these comments.

Meanwhile in the UK things like hot/cold mixer taps have only really become common everywhere in the last 20 years so a wet room may take a little longer!!