Stop disabling Adventures during meta.
I think they do it the way they do because the meta events need everyone on the map to participate to help make it successful. If x-amount of players are off on Adventures, it hurts others who are on the map for the meta.
It’s sort of similar to Silverwastes how the map has to agree to either be doing the Vinewrath events or doing a chest train – but not both on the same ip.
That being said, I think all the adventures should just open their own little instance and be available at all times. Frees up space on the map for those who want to do the meta, and for those who want adventures they are always accessible.