I just don't think they're necessary in the game. In a REAL LIFE park, yeah. In a video game based on a work of fiction? Not so much.
This a park management simulator... recreating the realistic conditions of a functioning real life park is the whole idea... serving guests, fulfilling their needs, and so on...
I'm no programmer, but from what I can tell, there's a logical problem is in how the game calculates the quality of services provided; simply put, it's complete nonsense. In most simulation games this is calculated by guests interacting with buildings; guests have demands and buildings provide supplies... but in JWE the game relies on buildings interacting with other buildings; specifically attraction buildings (rides, hotels) that provide demands and service buildings (restrooms, restaurants, shops) that provide the supply. For whatever reason, this seems to require buildings take on one role or another, without any overlap...
The same inconsistency appears with attractions and fun buildings; why am I placing arcades next to rides to provide fun? Shouldn't the rides be providing my guests with fun? It doesn't make sense... because apparently that's how the game is programmed... attractions are on the demand side, not the supply side, even if they should logically supply fun...
Again, the problem isn't bathrooms... it's how the game is designed...