I’m continually surprised by these kinds of stories.
Also by nobody seeming to have any idea about the situation. How hard is it to add a note to the customer file (and read it)?
In my personal experience dealing with e.g. HMRC, local councils etc does not offer me much confidence on that front.
The only benefit I can see personally is that there might be less room for error if there's less need for changes as people move in and out of properties.
1. You have more money to run the network.
2. No billing, sales etc. The bulk of most customer service departments.
3. Everyone is already connected.