EricTheDood
Contributor
Curious why we have our own limited and barbaric hand signals when there are systems already developed for clear communication.
"Limited and barbaric" hand signals aren't confined to diving. Just to name a few: airports, industry/construction (forklifts and cranes), referees/umpires/coaches, and military infantry.
"Clear communication" is subjective. ASL is meant to cover a much larger vocabulary, and thus can be less intuitive.