I think there are a couple of components to it. The first one would be that the issue was about, as you so rightly just identified, problem addresses. The fact an address is used by multiple people may not be a problem, but in these cases we were dealing with addresses that had been identified as problem addresses, and more work should have been done.
There are also cases where an address is used by multiple applicants. In that case, it should be noticed and a question should be asked, and maybe the address is okay. I think that just because an address is used by multiple people, and it's known to the department that it's used by multiple people because they're refugees or whatever, then that address for that reason should not end up on the list of problem addresses.
What we were concerned about was when an address ends up on a list of problem addresses, then how is the department managing that, how are the officers treating that, and are they doing all of the steps they should be doing when the department has already identified the address as problematic?