I think this is it. Imagine if instead there was a "siphon" effect where the instruments get miniaturised / sucked into the iPad. I don't think anyone would have been upset by that. It's the crushing that's at issue, and it does touch on an anxiety around the digital experience crushing the life out of the more physical / personal engagement with music.
However, i feel like apple's ad made people visualize a true deep concern about the future of art (and humanity) with regards to the recent advancements of AI. The fact that the number 1 consumer hardware company in the world blatantly acknowledge the fact that computers are going to generate every piece of content automatically in the future is quite troubling. (of course, that's probably not exactly what they meant, as someone will have to push that "generate" button on the ipad, at some point).