OK, I have a 3 Sonos zones in my house along with the 5.1 system. What I'm struggling with is what seems to be gross ignorance in the press that writes about Sonos vs. Chromecast Audio. I don't have CCA but I have read quite a bit about it. I get that conceptually, from a 50,000 foot view, they do similar things but when you look at the details I don't see how it's even close. With Sonos you get a complete, high quality, integrated ecosystem. I can leave all my speakers ON and fill the house with music in seconds. I can actually have L/R (bonded) speaker pairs. Can CCA even do this? All speaker volumes are sync'd, not from just the app but from the speakers themselves. I can do 5.1 AND have it do double duty as standard audio. The Sonos system can run on wifi OR Sonosnet - unimpacted by other wifi usage. Sonosnet extends the reach of your system automatically allowing speakers to be placed far beyond the reach of your WiFi signal.
What are the CCA folks using for speakers - cheap Bluetooth mono's, all within wifi range? Do they even care about stereo? If you're leveraging passive speakers don't you have to run around and fire up your AV receiver or amps to boot the CCA system up? Are people using a mish mash of speakers in a house all colliding on wifi with your kids gaming and Netflix streaming? What happens in CCA if someone changes the volume knob on one speaker in a group, doesn't that get it out of sync with the others?
Again, I get the CCA theory, I just see a big difference in implementation. I don't get a system that doesn't even allow for stereo - something people had 70 years ago. What am I missing?