I don't get it, wouldn't you have inquired about the culture, working style, expectations and such before joining?

Yes, most generally do tell you how their culture is. Contrary to popular belief, it's really a pain to do staff exit and hiring, so most rather hire someone that have been told the culture and likes the culture, rather than just wanting a warm body and end up having someone non productive, can't fit in and having to exit and go through the hiring process again.