No doubt other old guys like me are smiling at the recollection of similar "where will it end" comments when the Spanish got the Bultacos and Montesas to ride so much better than the previous British stuff. I'll admit there is a difference in degree but it was ever thus. The tyre issue, one of his hobbyhorses, was raised frequently by Ralph Venables in his weekly trials column in MCN (current riders may find the idea that MCN knew what trials was and reported on loads of local events each week with the SSDT getting several pages hard to believe - their staff could actually write in proper English then too) and was always scorned but, in retrospect, perhaps he had something.
As far as "ordinary" trials, as opposed to WTC go, rock steps which we routinely rode on early Spanish stuff now don't get used because folk seem to find them too demanding (though the modern bike practically rides itself up them). I observed at a trial last year which used straightforward sections unchanged from the Seventies and many riders were moaning when they saw them.
I agree that WTC is beyond a joke, in many ways, but there does seem to be a marked lack of ambition in the young at grass roots level. As Breagh has said on occasion, an old twin shock could be (and is) used to clean the bulk of sections in the modern trials I now ride. Not that I'm complaining at my age but nobody would have laid out a trial to suit pensioners back then.