I am against blow drying. I think hair should be stretched coz it's easy to part and braid, but I think it should be stretched in braids and airdried. When hair is blowdried, yes, it's straight and yes it looks neat when you braid, but wait till it gets wet (in the rain) or coz you wash it, and POOF!
When hair is airdried, it is like having prewashed jeans (Am I overusing the analogy?) There's no more shrinkage when you wash and there's no accordion effect when you wash due to your previously straight hair shrinking and gathering the extension hair into a poofy braid.
My hair just washed about to be airdried in braids before I braided:
My hair after I braided:
This is an old photo but I am using it to show you how the part of the braid that contains my hair looks after a wash, and it's because it's already preshrunken that it isn't affected by moisture. Only a handful of braids need redoing because most look just the same: