Imagine how the history of music would have been changed if Beethoven had digital hearing aids. I am fan of alternative history. Which is using 20/20 hindsight to imagine how history would have been changed if events in the past would have happened differently. I imagine Beethoven's emphasis would have been on performing rather than composing. I suspect he would also had a much happier life. Hearing loss and deafness have never been easy to live with even today.
Article about Beethoven's deafness