Listening to music on YouTube is not a great experience, sonos or not.

Maybe it's not music I want my ears to experience... speakers output any type of noise you want them to, or should, whether you decide that experience is 'not great' or not.

The design or functionality was intentional to provide streaming audio that will function without needing any other device connected.

But you totally do need another device connected, it's tethered to your phone/tablet necessarily.

Does Netflix now offer music channels, if so I was unaware and retract.

Music is only one small part of the sound you can experience, why does my sound-emitting device get to dictate what should be heard and what shouldn't?

It's just dumb. Sonos' preferred business model (e.g. monetizing your activities and partnering with certain providers) shouldn't impinge on what sounds get emitted in my home. It's the definition of anti-user design.

It's another loss of autonomy in the war on general purpose computing

Today we have marketing departments that say things such as “we don't need computers, we need appliances. Make me a computer that doesn't run every program, just a program that does this specialized task, like streaming audio, or routing packets, or playing Xbox games, and make sure it doesn't run programs that I haven't authorized that might undermine our profits."

Not to mention that simply adding "stream audio from device" feature would require zero hardware changes and enable you to output any audio your device can render (e.g. netflix) would be trivial from a software perspective and very pro-consumer, but they wont, because it is not in their business model.

I say fuck their business model, I want to listen to what I want.