I don't think that would help. A lot of them are oblivious to better ways of doing things so they don't realize the problems. Others are just suffering from stockholm syndrome.
and a lot of the are so desperate for a helping hand out of that dank hole that they will put on quite a song and dance. How much interesting work is going on, what an interesting, interested and supportive group it is..
If any candidate had done this at a place I was unhappy, I'd have told the truth. Honestly, a lot of candidates are drinking kool-aid by the time they walk in the door.
At interviews people get asked the classic, what's your biggest weakness question. As well as asking them to describe a typical day I always ask an existing employee what the worst thing about their job is. People often try to give a company approved reply but the underlying tensions with the tech/management/process are very difficult to hide.