Something like a live recording session? Where the musicians input is synchronized and gets streamed into the DAW of each participant so they can mix their own version. This could be fun.

During the first lockdown I watched a demo video of a remote VST plugin combo that allowed the recording artist to record his vocals, and the recording engineer to manipulate the audio each from their own homes.

Yes, but sort of decentralized. I can play with any combination of recordings that were recorded over each other. There’s some neat graph theory stuff in there.