Yeah I get your point and it sounds like a rational approach, but I think that the real-life situation speaks for itself. All the people complaining on your boards aren’t stupid or anti-conformist punks. They are consumers like you and me and it happens that, at the end of the day, the market is what defines standards (see Betamax vs VHS). And it appears that Type B are all over the place while type A are nowhere to be seen (except on Amazon or your shop lol).
You can’t deny this, save 5$ by not providing a key element of your product (see the other thread to understand why I say that) and hide behind a specification that has been declared way way way too late (for example MIDI specs where created and provided with the release of the first MIDI compatible hardware, not 8 years after) is not your most awesome move.
It is also interesting to note that this comes so late and in favor of the type A rather than type B while the AMEI is actually leaded by Japanese manufacturers (hello AKAI only using type A, main competitor of Novation and Arturia) and the MMA is mainly led by Yamaha (Japan), Mk2 (former Roland executive - Japan) and a few outsiders. I have nothing against Japan of course, I’m talking about manufacturers serving their own interests rather than bending to the reality of the market.