This is a pretty simple and straight forward QoL suggestion,
Allied Race Unlock Questchains can only be completed once per account, the problem is, that if you faction change the character that completed them, this restriction remains, meaning no character on your account will be flagged as having them complete, you regain the lost quests if you swap back to your original faction,
however it would be really great if these quests could have the tag added that they retain completion status always, (this tag already exists)
Currently collection tracking tools have account for this odd problem