After unlocking everything and enabling one to do the different World Quests in each zone with your main do one have to unlock everything on alts aswell, just in another order? (campaigns)
If so - what is the reason to change the order of the campaign for alts?
Your alts will have a second option for leveling, if you wish, called Threads of Fate.
Alts choosing the Threads of Fate will essentially automatically complete the campaign story, so you can level up via quests (including world quests) in any zone you want. You’ll also be able to instantly choose your Covenant at level 50.
I also read somewhere that Torghast is a possible way to level alts with Threads of Fate, although I don’t know if that was just a “nice to have” comment.
The Threads of Fate
Level up by doing world quests, side quests, bonus objectives, and dungeons.
Main storyline quests will be skipped and you will choose your covenant immediately.
You will have access to all Shadowlands zones except the Maw.
This choice is final and cannot be undone.