Look, the biggest reason I'm learning sign language is so I can have a community of people that I can talk to and shoot the breeze with, without having communication barriers.
It's not so I can talk to my boss. Or my teacher. I don't necessarily need sign language for that, even though it is hard for me to understand them.
It's so I can actually take part in and understand group conversations for the first time in my life. It's so that I'm actually a part of things rather than in a bubble floating along.
I might not be able to have this in all areas of my life, but at least I can have it in one place, among those who are like me.
People are talking about accommodations and whether "everyone" uses sign. Of course not everyone does. That's not the point. It's about quality of life.
Edit: I think one thing that debates like this miss, is the human cycle of life. All our lives go way, way beyond K-12 school. Or college. We are spending a lifetime with deafness. What do we need to be happy? Who do we need around us? Accommodation is one thing, but we need a space to be ourselves and not struggle so damn much to understand and be understood. In my view, that's where the deaf community and sign language comes in.