Where did anyone say they hated it?
Static flying has always been locked behind something. Originally, it was max level and gold. A lot of gold. Then it was Pathfinder account wide much later in the expansion with a crap ton of requirements.
Now it’s Pathfinder account wide at the beginning just for doing the leveling campaign.
Static flying is seen by Blizz to not be engaging and cheesing the content. Dynamic flying is their middle ground compromise to not keeping you on the ground. Blizzard has described it as more engaging with the environment and content than static flying.
Their philosophy is always to keep people engaged in the content. Before, that was on the ground. Now, it’s in the air using their type of engagement as they want it to be.
We get static flying in the amount of time it takes to level. For some, that’s days. For others, that’s a week. There is no wait and War Within is very ground mount friendly for those who cannot use dynamic flying.
It’s not hatred. It’s simply this is how Blizzard views their game and what they want that immersion and engagement to look like.