I found out this the hard way (by making the “mistake” I mean). I actually thought that I had executed wrongly the procedure but your explanation fits what happened to the saw’s toothline — it does look terrible. I kinda works but not very good I think.
I commend your explanation. I took me a while to fully understand it (and I had to re-read it with my saw and file on hand) but then it was an eye opener. Thanks a lot for your input.