Not wasted at all. You need to clarify what your use of ASL only entails. So far, it appears that you include the use of written English in that definition. To be factual, if written English is being used in any form and for any purpose, and individual is not using ASL only.
You need to go back and re-read my posts, if you have read them at all.
Once again I'll state it clear....ASL-only deaf are those that can not read a note, legal form, doctor's instruction, etc.because of their lack of reading skill...also they can not write a note to let there doctor know of a problem ("stomach hurt", is not enough, that quitting could even led to death), can not explain to a police officer what caused an accident, can not explain to an employee why he/she is the best for the position not in writing because of the lack of writing skill. They need an ASL interpreters help here. But put that person with a group of deaf using ASL, and they can go 100mph with their conversation. Got it now??
Just in case, re-read my posts where I you're into hearing kids that can run their mouth 100mph but can't read nor write worth a nickle.