I don't run "milspec" primers in my 223 reloads, I don't push my reloads hot enough
Being pushed "hot" has nothing to do with it. The issue isn't about the pressure of the cartridge, it is about the free floating firing pin colliding with primer cup.
as well as I don't repeatedly rechamber a round, at most a round is going to get chambered 3 times including the time it is shot.
Think of this. If you've chambered a round in an AR 3 times...your firing pin has hit the primer three times before you have shot the round. Every time the round is chambered, it has hit the primer. EVERY TIME. Why wouldn't you want a harder primer there?
The myth that you need to used a special primer for the AR is busted by the fact that their are hundreds of companies loading 223/556 for the AR-15 and few if any of them are going to have access to CCI primers.
Most companies loading .223 are not loading them with the intent of being shot in an AR. They are loading them for use in bolt guns.
I'll guarantee that any company producing a load that has 5.56 on the box has a harder primer in it. Not necessarily a CCI 41, but a magnum primer of some variety. Why? Because it is assumed that it will be used in a firearm with a free floating firing pin.
Keep shooting your standard primers if it makes you happy, but there is no "Myth" that you need a harder primer in an AR. It's a fact.