Portals to other reflections

I was watching people beat endwalker again lately and got to the scene at the end where you are told of other places to go and explore and I had a half confirmed theory.

Everywhere we have gone so far from that list has had a stable portal to another reflection. Are we going to find more portals in Othard and Myricidia?

I know we have the key now but it feels to simple to just be able to use it As we like. Maybe it like an aetherite and unless we attune to the reflection first it will not work without serious bodily harm or plot armor.

That way we can have a nice safe adventure to the 1st 9th and 13th, but the other reflections will need us to find other ways in first before we can setup stable travel. And those places just happen to be in the spots we have not yet visited.

thing is, there weren't really safe stable portals for most of the shards. the Astral Fissures to the thirteenth are typically short-lived and small, only by artificially stabilizing one were we able to go to the 13th post-EW, and the 1st hasn't GOT a stable portal. it has a sketchy summoning magic and then aetheryte teleportation that lets us slip through the gap to get back there.

We MIGHT get more portals into other shards, and Y'shtola is definately working on one to get back to the 1st with, but where and how we can only guess about.

I think Y'shtola's definitely going to use what she learned from the stable gate to the 9th to build one to the 1st.
I could could see a sort of stable interdimensional travel highway connecting all the shards and allowing for public transportation in the future. Though, not in game unless there's a time skip or a XIV-2.