Of course, but when it's a test line of our own that we use specifically for testing/diagnostic purposes, and have a number of spare VDSL2 modems we use for diagnostic purposes (e.g. to send to a customer having an issue on FTTC to determine whether it is their modem at fault), it's a difference scenario.
It would be *ideal* from an ISP point of view to be able to send out a configured VDSL2 device to a customer who is having issues, so they can simply plug it in to a single PC with DHCP enabled and it will simply work (as the modem can do PPPoE itself). The ability to also remotely connect to the modem interface from our office to view stats, CRC errors etc can be invaluable information when trying to diagnose a fault.
This is all for testing purposes, not for trying to mess Openreach about or expect them to replace any hardware we brick.