The use case is replacing laptops - calling it now that we'll be reading Bloomberg articles about the "Headset Class" in our lifetimes :). Definitely don't think apple has a shot in hell of pulling that off in 2023, but I'd love to be surprised.
I’m pretty sure Apple wants to rule a new product category with better margins and no existing users.
With laptops and increasingly phones and tablets most potential customers already have a thing from that category so it’s becoming harder and harder to sell and the profit margins and volumes are becoming smaller.
So Apple is desperate to create a new category.