If we want to take a concrete step to codify this in Style/Release Group, then my first suggested option would be to add the following to What to group together:
Different editions of a single containing different b-sides or remixes alongside the main track.
Different editions of an album containing different b-sides or remixes alongside the standard album content (even if as additional bonus discs).
And add this to What not to group together:
Remixed albums or singles where the remix(es) are the main content of the release, and the original tracks are not included.
The wording could certainly be improved, and examples should be added. Happy to get suggestions for both. We can add exceptions for particular edge cases if needed as well.