Printers should not be auto-added without permission from user

If Ubuntu 17.04 or 17.10 connects to a network that has a printer, a dialog pops open telling me so-and-so printer has been added. What the heck?

First, why is the user not asked whether to add the printer or not?

Second, auto-adding devices from a network is bad security practice. What if it's a hostile network? It is well established that printers are a common attack vector on networks. Ubuntu's auto-adding printers is the kind of thing that should not be happening by default without some kind of dialog that asks for permission to add said printer. If this is not addressed, it's only a matter of time before this leads to a CVE for Ubuntu.