Ahhh, another great quilting debate. Everyone has their own opinion. If you have been using steam and your blocks aren't distorted, I say keep doing what you have been doing. I use the burst of steam on my iron a lot. I'm happy with my less than perfect quilts and have no intention of changing. It is up to you to decide what you want to do, much like pre washing or using starch or that many other personal decisions we all make in our own quilts.