So far, all I have seen is everyone, apart from one person, talking about things they know nothing about.
Pilgrim, bit of a draconian solution...don't like it - ban it.
What if these people using metal detectors decided that, because fieldwalkers find so many artefacts, few of which get reported, a general ban should be made against anyone who wants to fieldwalk.
Detectorists have, as far as I am aware, every legal right (permission having been granted) to Metal Detect wherever they wish.