Wow, a great deal touched upon here. I'm just going to pick out what I recall and let everyone else discuss the rest
I don't think just because something is "Americanized" makes it less of an art. In fact, the Korean, Japanese and Okinawan arts greatly resist being American influenced, keeping their traditions if at all possible and keeping their language. By the way, it is them that is xenophobic and not us. The Japanese and Koreans insisted that their terms be used when learning an outside art. Now, who else does that? (Not a dig, just the way it was.)
Many Americans like anything "exotic" and want to keep the trappings of a foreign land, 'cause it's cool and mysterious. Or perhaps they also wish to pass along their culture with the art like many Filipinos and Indonesians, and that's nice, too.
The only thing we did to "Americanize" Uncle Bill's art, was use English terms in conjunction with the Indonesian and Chinese to facilitate learning. We've also taken advantage of advanced technology for training purposes (e.g., better knives, better treatment for injuries, better made equipment for drilling, etc.). Nothing is diluted, and some other arts can claim that that don't use "American" in the name-- mostly Chinese from what I've observed.
And the idea of the low horse stance being used only because it was taught on ships for footing is in the same category as the belt becoming black through use and dirt showing practice time. They are both stories to impart a lesson, and neither of them true. There are a multitude of useful and very lethal applications that end or begin with the horse stance in conjunction with leg traps, torquing, levers, angulation, whiplash, momentum and gravity that make the good low horse stance very useful. It's a good leg conditioner, too, building tendon and ligament strength as well as muscle endurance; some muscular strength also, but squats and deadlifts are superior for muscle strength building alone. But I digress, Judo's Kano introduced the belt system and the horse stance has combative uses-- now you have been enlightened.
Great topic.