No. The correlation is that bad expansions have bad writing and you notice it more because you're not enjoying the game.
Cata
WoD
now BFA
We're in the cycle of shitty filler expansion and then real expansion.
Cata = Filler
MoP = Main
WoD = Filler
Legion = Main
BFA = Filler
J/K the reality is that since post-merger, B-team is full of nu-male(and feminist) narcissists that care more about culture and statistics than video games. They try to to inject a bunch of their bullshit ideas for an entire expansion regardless of how bad they are (ie Cata) and then for next expansion they go into the last-resort bag to make everyone forget. Repeat every other expansion.
They're just trying to see how far they can get away with their shitty ideas. Liberals in a nut shell.