thanks for making this an interesting discussion.

after some thought, BIAB for 2023 should really work more like this...

only a "lite" BIAB client is needed on the user PC. The massive database of audio resources is stored on PG Music servers. no need to download or install these.

user creates song and enters chords as normal.

song generation is done on-the-fly on PG Music cloud servers. audio stems are streamed to BIAB client in real-time and routed through the mixer just like before.

might sound like science fiction, but we are used to streaming video on demand (much higher bandwidth requirements) and even video games, where all the game and graphics processing is done on remote servers and streamed to basically a web browser running on the PC.

this would even open up the possibility for running BIAB in the browser, with modern and accessible user interface and no installation needed, just a subscription, or lifetime pass.

food for thought...