You are absolutely right, Sandi! And I should have said that in my explanation. The quilts that I block are the ones that will be hanging in a show (or in this case be on display in assorted TQS booths with Alex Anderson for the next year!) and they need to be square and flat so that they look as crisp as I can get them after being washed. The chemicals have got to be washed out and the starch I use during construction makes them so stiff I can hardly fold them into a shipping box!
Most of my quilts are meant to be used and loved to death, and they go from the washer right into the dryer for that comfy "puckery" look. This is not the same look as stitched in puckers! That's a different animal!
The comfy "puckery" look does not do well in shows, so show quilts must be handled differently.
I have never tried to block a quilt on the wall, but I'm sure that it would work if you use enough pins. The weight of a full size wet quilt would be difficult to work with, so you might want to get someone to help you hold it as you pin it. Be sure to use something to get it square. Laser lights work well, if you have access to one, or for smaller quilts, a large square-up acrylic ruler is good. Or you could mark straight lines and square corners with string before you begin pinning. That's one reason I chose the floor covering that I did for my sewing room!
Hope that answers your question and thanks for reminding me that I needed to explain it further!