Why: Sprint flying is a very common want; however, for that I also have to dash, this both wastes my mana and can send me in an unexpected direction if I try to sprint fly absent mindidly. It is just a minor annoyance which makes the flugel tiara less appealing to use.
I am not the only one who feels this way, both people on servers I play on and reddit thread have discussed this issue on wanting to separate sprinting and dashing as a big quality of life option.