What gear do you currently have?
I do use my phone/pc/tablet to stream to the chromecast units and/or the various avrs/bluray players around the house over wifi. I do have an old phone I use out in my workshop to stream via wifi as well, just to put it to use, it's just handier if I didn't bring one of the others out to the workshop. I think the Bluesound stuff gets fairly good reports as far as ease of use goes, but seems a bit expensive just to have a box with its feature set near your gear IMO.
When you have a nice app for managing the music like Tidal or Spotify AND you do not have large local collection the value added of the different software packages (MusicCast, etc.) is very limited.
Think about it, even bulbs come with wifi these days. Google came up with ChromeCast but they are not interested in exploiting that technology for audiophiles or even just regular humans that want to get crafty with their audio gear.
It would be easy to settle with a Google Audio that strips out the DAC and adds a USB connector (or SPDIF). Add PoE and maybe Bluetooth APTX and you still have a 15€ device that allows FLAC streaming to a DAC. Multiroom and so on is already implemented with Chromecast for those who like that.
Coming to your question, I have two setups, the home cinema, which is basically a Yamaha Receiver with plenty of features, including an app to control it and some streaming capabilities from 10 years ago. I have upgraded it with APTX Low Latency using a Taotronics TT-BA09 which also allows me to use bluetooth headphones. This setup is quite good for media, movies, games and so on. I have wired speakers from the receiver to a second room too.
I do not buy the use case of having the music following you through the house... Most of what the multi room offers is not very interesting for me. Having an app and sources that you can play anywhere is.
So, that Media setup with all the surround, subwoofer, etc is very versatile and feature-cost effective but it is not offering a really good musical quality. Now I am adding a new setup in the living room which should be only stereo, only for music, with a focus on musical quality, only digital sources (mainly Tidal) and should not be very present.
For this last setup I have a pair of Wharfedale Evo 4.2 paired with an XTZ EDGE A2-300 and I just bought a Topping D50S that should arrive in a few days. For now I will be using an Android phone as a streamer and the Tidal app (Or any app that can stream to Chromecast), but this may change.
It would be great to have cheap Chromecast Built-in devices that are extremely dumb, just a USB out... But I have not found them.
RS.