If you add a release (or other entity) to "Tom Foo", and don't set a AC, it defaults to the current artist name (ie "Tom Foo"). When you then edit to rename "Tom Foo" to "Tom Bar", that AC still is set to "Tom Foo", not "Tom Bar". So if someone adds an artist with a typo in the name, not only do you need to edit to fix the typo, but you also have to go through and fix the AC for every release, track, recording, work, etc, along with other negative effects (see separate related ticket).