Dunno. My guess - it's their "learning good things from Vanilla" thing. Overall flying removal was about replicating TBC's 5000k gold farm, i.e. "earning" flying. And Maw is about not having ground mount at start, like it was back in Vanilla. Jailers' Eye is just soft cap mechanic, like one Visions had. Everybody hated this mechanic in Visions, because Visions were intended to be about exploration, not about trying to rush things as fast, as possible. And yet we have it again. I guess, it's too hide lack of actual content in this location. I wouldn't have anything against it, if it wouldn't be mandatory.
P.S. Currently I experience two problems with two covenant campaigns. In Maldraxxus I have 3rd medium opened, while not having 2nd medium. How can it be? May be that's because I've skipped that quest in covenant sanctum? Another problem: I've opened two covenant chapters in Revedreth, but I don't see any quests in covenant sanctum, that would allow me to start them.