iOS update can't be installed while audio is playing

I’m sorry, what? I have so many questions about this. Why can’t it be installed while audio is playing? How was it decided that disabling the button and showing this notice – without any explanation at all – is better than just… stopping the audio when updating, which requires a reboot anyway? What dark magic did earlier updates contain to allow such marvels of technology as… simultaneous decoding of audio streams and downloading of update data?!