I have the same opinion as Nettuno. CCA fits my listening scenario better than Volumio.
I have an Android smartphone and want to use it to drive my stereo. I currently use a CCA because it allows me to directly cast from a source of my choice, e.g. the Tidal app, to my stereo. This is very convenient.
Volumio is great and has many interesting features but is less convenient for my use. I have cast music from Tidal to Volumio, but it was a hassle to have to use a third party app such as Bubble UPNP. It detracted from simply enjoying the music.
Volumio implements DLNA renderer and Airplay for casting, but CCA implementation is missing to support all the apps out there that only cast to CCA. Thus it would be great if Volumio implemented CCA, perhaps as a paid feature (to fund its development).
PS: I know there is a Tidal integration in Volumio, but frankly, I prefer using the native app.