I am gonna tell you why. I got a Porsche Taycan last year with Burmester. Its audio quality is excellent, however there are limitations. I can play Spotify from my phone over bluetooth, which means reencoded lossy audio. It sounds awful. I can however play music directly from a usb memory stick, which sounds great, just as it should.

This is more a problem of Porsche, not having Spotify integrated into their PCM. It is coming on future models though. But we with a Taycan 2020-2022 model, will not get this.

So having a pile of ogg files is currently a great option.