Ok, so after doing some digging I found that older quests are categorized under "Legacy Quests" so they aren't exactly gone. But does this mean I need to start the BLM quests all over again if I want to finish them? It looks like I can't resume from where I left off...

As for the aetheryte attuning, I can't explain why those are all gone. Isn't that something that should have been preserved?