It's been 5 months since launch and i've encountered enemy players 5 or 6 times total, and i play a lot. World pvp simply doesnt exist cause there are no rewards for that. Flying won't hurt what isn't happening in the first place.
The ONLY reason to delay flying this long is to make everything that you do in game take longer, making the 'content' last longer.
They give players less and that takes longer to get done. It is that simple.
It is much more immersing to get on my flying mount and get from wq A to wq B myself then to whistle, get on a FP and go check websites while i wait.