I think I read that eventually everything will be available in Lossless format (except for iTunes purchases and iTunes Match).
I did a brief experiment and it did seem that changing Cellular quality to Lossless also enabled Spatial Audio streaming. However where higher bandwidth coverage is spotty, it seems not worth potential for dropouts or maxing out data allowance. It’s simple enough to download a few hours of music so that it’s available for CarPlay scenario.
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