I certainly considered Musicast.
Unfortunately the selection of speakers compatible with Musicast WiFi seem still limited to Yamaha products. As much as I trust Yamaha gear, speakers don’t seem their strength, and my impression of Musicast compatible Yamaha speakers is that they seem mostly plastic and their specs/measurements not impressive.
But to be fair, I haven’t experienced any of them, so I could be wrong.
Maybe I can be convinced otherwise by someone who actually uses them?