Well, this isn't really going to help the case, but yes, behind logins there really are some, trust me. Tongue in cheek aside, where I used to see this a lot as

Well, this isn't really going to help the case, but yes, behind logins there really are some, trust me. Tongue in cheek aside, where I used to see this a lot as a contractor was on projects where multiple companies were hired and each was responsible for some small part of the system that had to interface with the rest of it. The core problem is that you might not even know which parts of the UI need to update when your data changes, so what you advise is not always possible.