Do you lack some critical thinking? Here are the patch notes that changed the meta slightly from season 14-15. The changes may not be a lot but there was some slight changes in the meta due to those changes, like the nerve strike change. No more double pummel for warriors.
Now granted, the season was forever long but that's what happens at the end of the expansion. Whatever changes are in play, they can't happen until after expansion is released. If it is a season before an expansion, you won't have any changes once the beta starts. It's just not feasible as they are going to completely change the game at newest max level.
Holinka no longer posts relevant pvp information on twitter (too many people getting out of hand). They use the https://twitter.com/WarcraftDevs/
for any class changes for twitter communication. Sure they could be more clear on that being the primary communication for changes, perhaps give them that feedback.
At least put forth some effort to look into things or think about why they aren't changing things.