No, VCAs are quite different from the other two. They represent an external entity (the VCA) that can be used to control other entities, and they are mixer (signal flow) related only (i.e. have no impact on editing).
Persistent and quick groups are definitely related; we've already a few trenchant observations about what we've done with quick groups, and we will work on taking them into consideration as we refine how this works. But fundamentally, I see persistent groups and quick groups as orthogonal, and their main job is not to interfere (too much) with each other.
Persistent and quick groups are definitely related; we've already a few trenchant observations about what we've done with quick groups, and we will work on taking them into consideration as we refine how this works. But fundamentally, I see persistent groups and quick groups as orthogonal, and their main job is not to interfere (too much) with each other.