With Chromecast your iPad is just acting as a remote. It tells the WiiM Pro Plus what the music stream's URL is, how loud to play it and so on. Once the music is streaming you could turn off your iPad or throw it out of the window.I would like my WiiM Pro Plus to stream the music itself. Just like I know it from amazon music connect. If I were to use Chromecast, the WiiM would just be a receiver that plays the signal from my iPad. I didn't buy the WiiM for that, I could also have it via Airplay on my AppleTV. Or am I wrong about that?

This is fundamentally different from Airplay, where the data stream is transmitted by the iPad itself to the network streamer.
The only major drawback of Chromecast is the lack of gapless playback. If this is an issue at all mainly depends on the program material you're listening to.
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