No reason to, the other types are no less likely. Quite the contrary, if
the user specifies a GSM APN we're sure to use a DUN profile.
$ ./clients/cli/nmcli c add type bluetooth ifname '*' bluetooth.bdaddr 1C:E2:CC:56:6C:45 apn internet
$ nmcli c show bluetooth-1 |grep bluetooth.type
bluetooth.type: panu
^^^^ not cool