I think with previous expansions, there are reasonable explanations on how we can return to the previous zones. (Exclude repeatable dungeons or trials).

I haven't finished 6.1-6.3 yet so maybe it's explained later on, but I'm looking at World Unsundered and Ultima Thule, there's really no good lore explanations on how we can be returning to those places, are there?

The reason I'm asking is because they spent so much time in ShB to explain how WoL can travel back and forth and how to return to the First to visit those places.

I guess maybe this is a question more for roleplayers, of course average player probably don't really care so much.

For Roleplayers, do you visit these 2 EW places, and how do you justify it? Do you just build scenarios that these are memories we are visiting back in time, etc or any creative ideas?