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Only because CA will be a Cast destination and Plex will show that.
But the way ChromeCast works is that Plex will send the file info, and the CA player will play it, but all ChromeCast fixes the stream rate - effectively downsampling - at the same time gapless is not support by ChromeCast as new files are fetched on file change.
Basically, if I listen to Marvin Gaye or Beyonce it's going to suck as the gapless isn't there and it has downsampled.
It's good enough, but not great.
Seems that CA streamers show up as an endpoint within Plex from a quick google. Its built in DAC sounds nice or you can output spdif if you want. Price is £450. Whether that’s cheap or not is relative.