Late to contribute, but I will add a little. Recently I reconditioned a Stanley number 4 that had a little pitting on the sole. I lapped out 90% of the pitting and stopped because it was nice and flat. After tuning the rest of the plane I used it for a while. It cut perfect at first, but after a few minutes of use I started seeing the same lines in the wood and noticed chipping of the blade (honed at 32 deg). I did this a couple of times and noticed the smallest shiny fleck on the board. It came from the mouth of the plane, I think. I lapped the bottom again to remove all pitting, cleaned the wood with a metal brush, and the plane worked fine.
Short answer - be sure the sole is in good shape. Especially around the mouth.
that you also aspire to lead a quiet life, to mind your own business, and to work with your own hands, as we commanded you...
1 Thessalonians 4:11