The categories of streaming audio and voice control are very fluid, with competing but not compatible technologies on offer from Google, Amazon, and Apple.
Because of the changing landscape for these technologies, we chose to provide the capability to use whichever streaming technology you choose via outboard adapter. For as little as $35 USD you can add a Google Cast audio adaptor, or for a little more an Amazon Dot.
With either of these you get streaming capability from many sources as well as compatibility with voice control from other zones using Alexa or Google Home Assistant.
– The +TEAM