ASL is just very "well-developed" to the point where it's actually a language with its own syntax, grammar, vocabularies, etc. many foreign sign languages are bastardized or incomplete which is why you may see one sign may means several things and the only way to differ it is by speaking/lip-reading as well as depending on context of the convo.
in foreign countries - just about all deafies have either CI or HA and the mindset in their countries is very audist/oralist-based. so their sign languages are structured around as an "aid" for their speaking.
thanks god ASL is not like that.
