Then what, may I ask, is the point of ground radar? It must be good enough, otherwise airports would not invest £million in it.
It aides the controller in identifying the aircraft he can see out the window. Imagine looking at 8 or so A319s or B737s all painted in the same company livery. A quick glance at the ground radar will remind him the order they are on the taxiway.
And therein lies a great problem that your DofT seems incapable of addressing. They think they are making aviation safer, when nothing could be further from the truth.
Has nothing at all to do with the DfT. Air Traffic Controllers, including trainees are still permitted to be in the cockpit on famil flights. It's more that company budgets restrict the access and availability. It's been a couple of years since my last famil flight.