Well I suppose you could wag your finger at a nation state hacker who has just abused the remote disconnect functionality, and tell them they were not allowed to do that. Tut tut.
And even if the smart meter is meant to have remote re-connect functionality it might not have that any more if a hacker has found a way to "brick" the meter after issuing a disconnect command. Or disable the re-connect function and any remote software update/recovery function. Or disable the network that was meant to deliver commands/updates.
If you are into managing security risk these are risks about which only an amateur would bury his head in the sand. And IMHO they most likely require a recovery plan rather than explicit acceptance of the risk and its consequences.
I have no idea of how much risk there is in reality. But does anyone here really think the security weaknesses of smart energy metering system are not on the agendas of the nation state hackers out there? My question to E.ON Next was perfectly professional and the lack of a response was, IMHO, pretty poor.