I think FLAC support in the dekstop software would be useful for people, however I suspect the majority of people DON'T have FLAC audio.
Playing FLAC on the device seems to be overkill to me though (apart from the serious drain on power it would be on a HDD based system, or the space on a SSD based system).
Noisy office / public transport / parks are not the place to appreciate the additional quality of lossless audio, even with pricey cans. If you are listening at home i'd think play it from the PC / home network.
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