Ok hear me out on this one before you decry how annoying this would be:
Back in ARR or 1.0, in order to enter each tier of coil you had to be outside the raid entrance as an entire party. This actually brought about a very unique experience:
1. you get to see friends and regulars and see how everyone's gear is progressing each week
2. there was a lot of community action around the area
3. it made the overworld feel way more lively
Some of my fondest memories were more from the fun I had outside the raid than actually in the raid.
Right now we have the convenience of not doing this, but as a consequence the overworld is pretty dead outside of things like Yokai, and everyone just hangs around in their FC/personal house. It's like the same issue with WoW Garrisons isolating players.
And with cross-world being a thing I don't mean everyone should need to be in the same world, just the same zone as the entrance is.
On the flip side, I can see how this would be annoying, which is why I'm proposing that this is only applied for like the first few weeks of a new raid/dungeon.