Apologies - my experience is that frequently when people speak of FLACs they are referring to much higher bitrate FLACs, and that's what I thought you meant. Presumably the reason Apple drags its feet here is that their M4a files are also lossless, so they feel there's little point? Apple do love a proprietary, well, anything.Nobody should be able to tell the difference between a CD and a FLAC file, because there IS no difference. That’s literally the entire point of a lossless encoder.
The vast majority of my classical library is personally ripped 16/44.1 FLAC from original CDs with .log/.cue, 100% bit for bit identical to the CDs they came from.