Acoustics, demos, b-sides, live versions, etc. Remixes featuring a well-established artist (during an era) should be single-only. Not like Sam Smith who has now managed to reissue his album with the bonus remixes from his era. Milking it much.
Remixes used to be much better in the 90s, you know when they actually put effort in and re-recorded vocals and stuff. The Together Again DJ Premier remix is a totally different take on it and it's just as good as the original, and not to mention SWV's iconic Human Nature remix of Right Here