NCB — I hear your criticism and you have a point. Nevertheless, I do think that with that demographic there is a greater protensity to have some opinions that are off the grid compared to the mainstream positions of the Torah community, as compared to people who hail from a strong unbroken mesorah. Again, propensity not likelihood. Even within that demographic they mostly do not suffer from this type of malaise.
Similarly, you’ll also notice this phenomenon in that among otd groups there’s a greater propensity (not likelihood) that those from a less stronger Orthodox mesorah are more likely to fall into compared to those from families with an unbroken Orthodox chain.
So I agree with your overall point but think my point has validity as well. Perhaps I put it too starkly.