The more I think about it, the shittier the deaf community seems
he went deaf, and panicked, and glommed on to this "being deaf isn't something that needs to be fixed" community.
They immediately cut him off from his career and family. She moves on without him, because to her he's just gone. When he finally gets away from the cult, he has nothing left, not even her.
If he'd taken a few weeks to get used to the new reality, with her help, he could have learned to sign, and learned to keep a beat in a new way. They'd barely miss any gigs, and have each other
So, yeah, this movie seems pretty subversive. Deaf cult doesn't look good.
"Be bold, and mighty forces will come to your aid."