what ever you want to use and works for you is fine.
some people swear they would never consider anything except cotton thread in their quilts-
i find this very sad-
there are so many wonderful threads out there to try!
some with beautiful sheens, some with wonderful verigation,
some that disappear- some that show up---
why limit your self to one type? you miss out on so much
just like those who have always used ONE BATTING- and will not consider anything else....there are so many wonderful batts from all kinds of fibers that work so much better for different uses.
be adventurous! don't let yourself be limited by other peoples (tunnel vision)