My teacher is quite relaxed with relevee or tiptoe issue. She is using both names now and then.
She is teaching steps always with standing flat on the floor and keeps reminding us that if we master the steps, we can also try doing it on relevee or tiptoe as the target. I'm in intermediate class and i have never heard her mention that tiptoe is "necessary". I have seen that during her performances she uses high-heels.
Personally, i try to dance on tiptoe because i feel that i can move faster and somehow more flexible that way. Have to add that i'm quite short, so it might be that i feel better about being bit taller for few hours a day
