Chromecast audio devices again are convenient devices to send audio to different systems throughout the house but not for serious listening IMHO.
Plus sometimes they work okay sometimes not. I guess that is part of the reason Google bailed on CCA hardware. On the flip side they are so darn cheap they can be fun to try.
You mentioned the Laptop connection is working better for you - time to explore the music available as you mentioned.
Have fun!
DS