so, what is the point you're trying to prove?
reba is right, no one can judge our language by number. like vampy said, we don't have adverbs, articles, props and so many more in our language. we don't even have 500,000 fingers, just ten and they hearies have more than 30 teeth along with a tongue drumming them and over 40 soundtones plus millions of drum hairs in ears where they compromise with english so of course can we say they have more than us?
in fact, 60% of ASL we use our body language and facial expressions which is why we have fewer words in dictionary. if our hands are tied behind us and only we are to communicate with our facial expressions, we could go on conversing like normal, no words at all. totally seperate from gestures because most of our facial expressions aren't univerisal. so only visual languages, ASL/LSF/AUSLAN/ETC., all in one is special, nothing like other spoken languages. period. so unlikely english, there are so much unnecessary words that are missing.
you want 10,000? okay, sum up traditional ASL, west/east/south/north ASL and as well as other countries such like france that uses ASL too (as our language is always changing in time), I'm sure you'll find more than 20,000 or so.
but again, numbers don't matter and why the discrepancies? because people like you are making it more complicated! seriously, chunk these links out dear, as you can see it only (says) sees basics! ASL is OUR language, end of discussion. I don't care what they "think", "see" or "discover".. otherwise we'd be unable to converse our needs at all. and, obviously, to understand "the discrepancies", you'll have to be deaf to understand.
Again, numbers are not my point, though your comment about 20,000 signs was helpful to my cause. Where are they?
And I am not making it more complicated than necessary. In fact, nothing I quoted was in the least 'complicated', not even a little bit complicated.
Languages are not an island. What works for you is only "just fine" up until you have to talk to someone else who doesn't quite 'get' it. If you can't get them to understand you due to a language that isn't developed and documented to its full potential, then don't cry about isolation, because it is not their fault that they do not have sufficient theory or documentation available.