I imagine having deaf Sims would probably take a while to develop because of what it would take to create that communication but I would be so amped to see a Sim sign language one day! It could even be a whole skill for hearing Sims to learn too
I'd love to see canes and crutches as well. I hope mobility aids are something that get developed, and it better be base game. With all they've been doing these days to deepen queer inclusion, expand skin tones and curly hairstyles, and now polyamory inclusion, I actually have some faith we may start to see some disability representation