The 4 at a time method is how Jenny from MSQC does hers and I don't like the bias edges, so I have to re do her designs so I come up without them. I think I'm in the minority as it seems that most don't have a problem with them. If possible, I try to use the 8 at a time method, which does NOT result in bias edges. This is one of many variations on the grid method to make multiples. Here's another that makes a dozen.
http://quiltsbyjen.ca/how-to-make-ha...s-with-a-grid/