It seems that a lot of posts were clutter. Not a big deal. Lesson was learned, especially when those who wrote them have a clear interest on this thread. From now on I’ll try to avoid them. Let’s call it spam.
I’ll rather concentrate on answering people’s questions, of what cable I recommend to their setup, and add new sharing to my table and post it, with comments if any.
Regarding some big names in the industry that do their own spades and banana plugs, I doubt it. It is most likely they have an OEM source, to order and buy from. However, even if they do make spades and banana plugs, it is not a good idea to connect those directly to the thick cable (like a 4-0 AWG). From my point of view, they never wonted too, as they never thought this is the solution for the speaker cables problem. If they would, they most likely would try it already.