In Cata Blizzard made a bunch of zones like Gilneas, Kezan, and Lost Isles that got used once and then they forgot about them...
In BFA they made tons of island expedition areas that would've been fun to quest in and explore but then booted you out of at breakneck pace
I haven't heard of any ill-used or wasted areas more recently though, but I also haven't been subbed since BFA
What's the verdict, is Blizz getting better at one use and not spending loads of time on one-use areas?