Unfortunately neither of these seem to be true for Blizzard. For the first point here, I’ve been here saying I want change all this time, and it has had no significant impact on the story or presentation. To the second point, Kyalin has been unsubscribed for a good while, and it also has had no impact on the story. BfA still happened regardless of what either of us tried.
For example of something both Kyalin and I participated in was this thread on the previous version of the forums giving feedback on the introductory questing to Darkshore:
And flaws we pointed out remained, were not changed, and still haven’t been addressed.