I would like to see something like this in the Web simply to allow for collaboration.
I would love to see a DAW where randos upload just a track—maybe a drum track. Other's can "create a branch" where they jam along: add a bass track. And let the jamming, branching, songwriting commence.
Why does that require the web? Networked collaboration integration already exists in mainstream DAWs without all the downsides of forcing things into a web browser