While I don't understand all the technicalities you talk about, I understand (and agree) with the gist of it. It's something that myself I've wondered about, but currently I have no way of testing the BEQs that are done at AVS. HOWEVER... people with very capable systems have tried them, and are satisfied with the results. So, they must be doing something right, at least the BEQ version is an improvement over the heavily filtered mixes. At this point, I'd thought you'd have at least gave a couple of them a try, instead of just assuming they must not be good.
Also, you seem to have a very particular view on ULF, as you seem to advocate moderate levels of infrasonics, and give more weight to the Low/Mid bass range, which is a very interesting stance. I'm not ULF capable, but on principle, I feel inclined to agree with you. But you should give some BEQs a try, especially those which have a 30hz roll-off, and see how the mix sounds when turned into full bandwidth. The graphs now come with a heat map, so you can visualize the impact of the EQ on the bass along the movie full duration. Of course, it's just a humble suggestion.
Luckily, early this year we've been gifted with some fantastic full bandwidth mixes that require little to no BEQ at all (Hunter Killer, The Cloverfield Paradox and Overlord), and things look bright for the rest of the month, with Spider-Man: Into The Spider-Verse, Aquaman and Mortal Engines coming out. This year looks very promising in terms of bass.