Control of vibrato helps your musical expression.
Yes indeed I have gained a lot out of playing scales and etudes.
You can sightread better if you know your scales and arpeggios.
I think it is most important for a teacher to play the pieces and studies that are being played by the student.
The quickest way to unlock your talent is to take the flute out of the box.
Scales played in the correct musical way are very exciting and rewarding.