^ I live up north and I've never seen a single RV dealer that uses the blow out method. You always see the pink in the sink when you look at them in the spring. Not saying they don't exist, I've just never seen one.
I use A/f, really don't care what others use, it's their equipment to do as they please.
I really can't understand how anyone thinks blowing it out is easier than a/f though as long as you have the bypasses installed. I'm done with a/f before I even have my compressor filled with air. I've never had an issue getting it out either and have never tasted it.
