So, I work in the Arts (Community based, schools and Centre's and such). My Boss is studying to become an interpreter in BSL (UK here).
One of the great things about this show, it was never presented as 'Omg, she's deaf!' and Amaya's deafness proceeded her, no. She was simply an awesome character who did awesome things and even had segments of her own where, unless you know sign language. You wouldn't understand what she was saying.
Her being deaf was simply a part of her character, not the most important aspect.
By taking something like this and just making it an everyday normality within the context of the show is amazingly progressive, doesn't pander to anyone and gives legit representation.
As a Scotsman, I was amased to see the Elves ALL have various Scottish accents and it was never done for laughs or as a joke, it just simply was.
That's the key thing to representation in shows, do not pander, do not retcon things to 'it was that way all along', just make things be as they are and make them normal within your own medium.
This show, does that exceedingly well.