I'm simply pointing out that Blizzard has made it so that flight doesn't actually do anything besides cut down on the tedium of doing tasks that you've already done to get flying in the first place.
If you already enjoyed doing those things then flying doesn't really add anything besides making them take less time.
But if you didn't enjoy those things and we're only doing them to get flight, then what did flying actually do for you now that you have it? Are you going to fly faster to things you don't really want to do in order to get things you already have?
So you'll be more efficient at doing content you've already done. Great. Tell me again about the great Olympics of WoW where you're competing against the entire playerbase to see who's the most efficient. What's the grand prize for getting more done than the next guy? The idea that you're competing with anyone in wow outside of rated arena or BGs is a lie. Content doesn't go away if someone else gets there first. Bosses don't drop less loot if someone tags them before you. Respawns are a thing.
Because if you really enjoyed the ground experience so much: it is still there. And if you only got flying to be more efficient, then you'll recognize that the value of flight doesn't even come close to matching how much time and effort was required to get it.