I'm ex-TG3 and been out a good few years so I don't have the insight of how all this new TG4 came about. For what it's worth here's my fourpenny worth.
What would make sense to me is to simply put the techies from AE TC and AF into a technical role looking after the tin, software apps and builds, firewalls and AV . That would mean the TCOPs looking after system admin like helpdesk, passwords, accounts and so on.
Then there would have been a logiical split between the "soft" tech skills of the TCOP's and the techies would still be dealing with radar, radio and the other gubbins that requires the hard techie skills.
Actually a bit like most civvie business handles technology.
A telephone operator handles calls, if the console breaks an engineer fixes it
A Salesman or motor engineer uses a computer, if they need a new app or lost their password, the admin at the helpdesk will sort the password out and book an engineer to install a new app
What is completely obvious is that TG4, as described here and elsewhere, is not fit for purpose and unless it is changed to something like a normal structure which takes account of entirely different skill sets it will never work within a military structure where people cannot move jobs to suit their own career progression.