If there was a specific postal service for each building, each with their own set of requirements, you mean. And each, of course, insists that theirs is the One

If there was a specific postal service for each building, each with their own set of requirements, you mean. And each, of course, insists that theirs is the One True Way. Yeah, that's a nice world to live in: change yourself ten ways from Sunday to fit into various, mutually incompatible and completely arbitrary rules; all so that the original developer making the rules up on the spot would have an easier job.