The subsonic drop-tune groove. In lossless, you feel the string tension. The panning of the rhythm guitars (hard left and right) is flawless.
James’s finger-picked nylon string intro. You hear the squeak of his fingers on the wound strings—humanity in the machine.
In FLAC, the reverse-reverb on the guitar intro is crisp and disorienting. The kick drum punches your chest rather than your ears.
If you have the storage space (and in 2026, a 500MB album is trivial), there is zero reason to accept lossy audio. Your search for "Metallica Metallica -the Black Album- -flac" ends with a simple truth: You have never truly heard this album until you have heard it in lossless audio.