I own a LN 4 ½ plane and a stanley #4 retrofitted with a Hock A2 blade.
After sharpening them as I sharpen all my planes, that is without secondary bevel and no rule trick I find that they get nicked very easyly, especially with hard woods and end grain planning.
On the other hand I have a Stanley # 5 retrofitted with a Hock High carbon blade that planning the same woods and end grain doesn’t get nicked as easyly.
In order to give it a try I sharpened both A2 blades as it is recommended in LN web page and oh! surprise! they don’t get nicks as before.
It is my assumption (because I have no idea to what is due) that the A2 steel is more brittle than carbon steel and maybe that the crystals of A2 steel are bigger than carbon steel hence its fragility when very thin or sharp edges are made.
I wonder if any of you have noticed the same, and wheter I might be right in my assumption.