I understand your concern. I would side with you in a heartbeat if it weren’t only one side mission, and if it wasn’t possible to group up with other people to complete it.
I loved doing that mission. I love music and following the music without a marker was super fun for me. While I agree that game should be inclusive, doing what you suggested would diminish the fun of the majority of the players, in a mission that is just optional, and that can be done with help and friendship anyway.