I discussed my issues with Hidden Fates card quality here.
It was more to do with cards warping after a few days, and the odd card with what looked like printer oil stains, so even though I agree with you on the gradeability of the cards in Hidden Fates, I do not think the quality of the product/materials was acceptable from a colectors standpoint.
Overall, what I am trying to point out is how the overall quality of English product leaves much to be desired. If you are a graded card collector buying sealed product, you risk getting damaged cards, if you are a binder collector, you risk having cards in your binder warp completely after a few days.
The fact this happens in English product but not in Japanese, also demonstrates that English card collectors are paying the same (if not more) for a lower quality iteration of the same product, which is unfair.