They used to be in the game. I imagine they skipped them in this version (2.0) so they could finish and release it faster as it is a huge update that has taken more time than any previous updates as far as I know. The FAQ on discord says the bathrooms will contain some kind of puzzles at some point, so bathrooms will probably return in 2.1 along with puzzles. That's what I think anyway.
But, you know, it's not like you have time to use a bathroom when a yandere is chasing you anyway lol.