I know people behave very differently when within hearing distance of a higher up. Now imagine you are the highest one... every person you meet, every day, is constantly thinking hard about filtering what they are telling you.
It does not matter if you pick random locations, people will still modify what they are saying when they see you.
But it helps a bit. There is higher chance you will finally meet some people who are not afraid to tell the truth. There is also chance you will start seeing some patterns. It is probable that managers will clean up a lot of stuff when they suddenly get to know about a visitation, but they won't clean up everything and you will get at least some glimpses. Visit enough restaurants enough times and glimpses may form an image of reality.
It does not matter if you pick random locations, people will still modify what they are saying when they see you.
But it helps a bit. There is higher chance you will finally meet some people who are not afraid to tell the truth. There is also chance you will start seeing some patterns. It is probable that managers will clean up a lot of stuff when they suddenly get to know about a visitation, but they won't clean up everything and you will get at least some glimpses. Visit enough restaurants enough times and glimpses may form an image of reality.