I think I see a man with a bee in his bonnet (I hope that's right. English slang always worries me)
I am not a big fanatic for using the radio when enjoying myself in the Yak, but even I can see that there are occasions when a trained individual on the ground can help everybody concerned.
In fact, your FISO system is much better than ours. In France, our A/G people are basically unlicensed and the quality is far more variable than your FISOs.
When I fly over to England, my simple response when a FISO oversteps their authority is to say:
"F-xxxx. Please confirm that your callsign is ABC Information and that you are offering a Flight Information Service only." That has never failed.
TvR