The Shape of Water is great. I watched it last night and despite (because of?) being a cross between Amelie and Bioshock, it's utterly glorious. Off the back of that though I found this article in the LA Review of Books that does a good job of discussing Deaf Gain and cultural appropriation.
“While it is exciting to see these films, among others, trying to show us Deafness as a part of diversity and as something that is a “gain” rather than a loss, we won’t fully get the Deaf experience on screen until writers, directors, and actors are actually Deaf people themselves. Right now we have movies about Deafness for hearing people. We can hope for a future with many Deaf and disabled stars, but till that time, we must remain content to be “people of the eye” on rare occasions and get our gains when and where we can.”