Don't forget number porting is recently new. The FCC started requiring carriers do it in 2003. Since the telco's were forced to do it, you think they are going to put any effort into it unless legally required to do so? They don't care.
Stop commenting on things you know nothing about.
Many landline and voip providers really do just require a signature.
Phone companies seem to be starting to take the issue more seriously as of the last few months due to the aforementioned bad press. Verizon just forced me to create a PIN by Jan 24th, 2017. So I didn't have a PIN until less than a month ago.