Apple developers have one serious problem: the "not invented here" syndrome. As everybody was using mp3, Apple wanted AAC. FLAC? Apple didn't invent it. So they just support their own rubbish instead [1].
>just support their own rubbish
They support ALAC, a lossless format. Sure, converting is a slight hassle, but doesn't take long. The quality is the same as in FLAC.
Another good reason not to buy or use Apple devices.