Yeah, but like a I mentioned, there could be cases where you did do your research and then plans changed and you check the official stamp that was given and now that is your responsibility to double check what they gave you with what is online (which can also be a nightmare sometimes to find the correct info).
So what happens if a person is not aware of how long they are supposed to get stamped in. Maybe they planned on staying only 2 weeks and never checked the finer details. Then something happened and they want to stay longer, check their passport and see they can stay until X date and then it ends up being their fault?