I am okay with SIM only service from PM except my only concern is that anyone can buy a SIM card and activate it using fake identification. In that case anyone who knows my address and name can activate a line and MAY use it for illegal purpose.
If PM could implement something to upload a scan copy of your DL or Government issued ID after activating (lets say withing 48 hours) then they can easily verify account holder's identity or else suspend the account until verified.