For me it is both therapy and salvation. I don't think either of those things fall under the heading of hobby.
It gives me back the ability to be a useful and contributing member of my community and society; something I had lost when I became disabled. When I lost that, I sort of lost myself too.
In the midst of trying to learn to redefine myself as disabled and no longer productive, I discovered quilting and could see myself in a positive way again!