Exactly. The devs stated they were "removing" the fly sprint due to technical limitations preventing casting spells or using abilities while flying. This is why they changed it to a base +10 increase to fly speed. But since they left it in we currently keep the +10 to base fly speed AND get the fly sprint. We can play around with the fly sprint and fly faster all the time. I love it.
Please devs don't remove the fly sprint. Everybody wins if you leave it in.
[Y][Y][Y][:P][:P]