When I used to do alignments. Zero toe was a no no unless the car was a track car. If I had to guess... about 70 percent of abnormal tire wear is due to incorrect toe in followed by camber.
You have to realize that toe is set in a rest state. All suspensions have some type of movement even new. as soon as you start moving the toe will try to toe out especially under braking. If your car tends to be more skittish under braking you have too little toe and most likely worn components causing a excessive toe out condition under braking.
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