I'm prepared to concede Judo as an exception because of the widespread standardization of technique names that would otherwise be difficult to explain.
I'm not convinced on Karate and other Japanese arts. Somebody mentioned international competition earlier. Really, (a) how many karateka compete internationally? (b) it doesn't make sense for millions? of karate kids to learn Japanese words because like three people in the world want to compete internationally and (c) if someone wants to compete internationally it will take them about a millisecond to learn to say stop and go in another language - be it Japanese or otherwise.
I call Japanigans.