But you still didn't answer my question, what do you use flying for other than its use for faster, safer, and more convenient form of travel?
I did use both, when flying wasn't an option for me IE Late Vanilla, Early TBC when i couldnt afford flying, and most of WoD, I did most of my travel by land or taxi. Even after pathfinder was unlocked I didn't get it for a couple months because I felt no need to, it wasn't a necessity. And lastly, unfortunately its Blizzards game and whatever content and feature they add into the game, for what ever the reason they deem fit is just that THEIR REASON, its THIER GAME. If they said they added flying for "more fun," then it was added for more fun, if they said they added it "convenience and its perk" then that is the reason. But you can't sit here and say "Blizzard is wrong for why they put XX in the game". if Blizzard say's they added LFR so everyone can have fun in raids, but you yourself dont have fun in LFR, does not mean that it wasn't added in for the fun factor. You can't try to use your opinion, or anyone's opinion, as fact and say Blizzard is wrong.
But at the end of the day it doesn't matter, we all get flying in Legion eventually, rather that is in patch 7.1, 7.2 or last patch, we dont know, as they never actually stated when. We will just have to put work into it over time(and get perks along the way) instead of saying "Hi FLight trainer here is my bag of gold! Thanks for my flight license!"