Such unneeded barriers no longer have a greater purpose, please remove them. The no-fly zones in some of the older content no longer make sense and simply hinder exploration. I’m not saying to add flying where flying doesn’t exist, just remove the flavorful barriers to flight certain areas have.
I understand ActiBlizz is a multi-dollar company and can’t afford to pay any attention to fleshing out the world if it is older than current expansion content, but it would be great if you did.
(Maybe put Azuremyst/Bloodmyst Isle and Quel’thalas in Azeroth while you’re at it. I know I know, I ask too much.)