I don't mind doing the msq again on an alt, because it's honestly the reason I create alts in the first place, wanting to experience the story fresh with a new character. But certain things would be nice to have account wide. Like full access to the calamity salvager and event items you unlocked, achievement rewards, shared housing.

Basically anything I have to grind excessively for, I do not wanna do again. Or getting event items that are impossible to get again and can only be obtained through the mogstation.