Why can't a 'dumb' hub be appended as well? I have them at my new apt complex now, not the 'smart' ones, and they seem to work alright. It's right next to the mailboxes for the complex. Again, it's only USPS that uses the 'dumb' hub, all the other companies just drop things off at the door. It's not a big deal, at least for the area I live in.
There are plenty of other properties that could utilize this too such as multi-tenant office buildings and plenty of other non-apartment building use cases.
It also productizes these boxes so they can buy one of these instead of setting of a mail center and doing the subsequent maintenance (ie: cutting keys, replacing lost ones, etc). And it notifies the people by email/mobile which makes it a nice value add-on for property owners to sell with the property.