

It may look silly to most people, but it actually looks like a great accessibility device. Assuming it can hold the device without support from the user it would be great for someone who struggles to hold it up or keep their arms bent - use a bluetooth controller on their lap and they’re good to go.
It’s very possible. Someone correct me if I’m wrong, but I believe the CPU and APU do a little acknowledgment handshake every time an audio program finishes. I’m willing to bet there a lot of instances of the CPU subroutine waiting on the APU, e.g. an animation waiting for a sound cue to finish can advance slightly faster.