No, they are definitely not obstinate, as this topic is full of confusion, mis-used terms, and modernist infiltration going back to the 1600s (yes, there were masonic infiltrators in the vatican back then).
Right, and this is where I get off the boat from the Dimonds. They hold that anyone who believes even in a limited Thomistic BoD for catechumens is a heretic and outside the Church. But the Church has never condemned this opinion and has even declared Doctors of the Church several men who believed in it. Consequently, this position is objectively schismatic.
I wish people would stop talking so much about BoD. Yes, it's THE weapon used by the EENS-deniers to gut EENS dogma, by extending it to anyone of "sincerity". But it's a mistake to go back in the other direction and conflate Thomistic BOD with the heretical propositions promoted by the people who ABUSE BoD. This creates an incredible amount of misdirection and a huge distraction from the central issue. It's a mistake to feel that you have to reject St. Thomas in order to uphold EENS. Not to mention that it's, tactically, very stupid. If you're trying to convince someone of your position, you're not going to get very far when you have to attack the Church Doctors. "I'm going to take the word of this fool over that of St. Thomas?" No, in fact, we have to BACK the teaching of St. Thomas regarding the need for explicit faith in order to be saved. Once that argument is made, THEN later one might revisit BoD. But they use the boogey-man of "Feeneyism" to simply shut down the entire discussion.
Similarly, the pro-BoDers do this. They keep citing St. Thomas et al. regarding BoD as if it proved that infidels can be saved, which it does no such thing.
So the important thing is to strip these types of that weapon, and reappropriate St. Thomas for the DEFENSE of EENS rather than allowing the anti-EENSers to co-opt him as a defender of their errors.