I really do not understand why the AFISO at Elstree comes in for so much stick. There are several experienced controllers working the r/t, and if you take the trouble to go and see how efficiently they work you might then understand what a testing job they have.
You are quite correct that they are not ATC, but they provide a very valuable service in a busy training environment, with all that that implies with (erring) solo student pilots.
It seems that when an organisation becomes an 'aunt sally' everyone becomes very negative, I think a little calm reflection might produce a more balanced view.