You ever see how much regular brick just gets smashed and dumped after a demo? I totally had the same thought about them being weaker. But last month, watching a crew tear down a small wall, the regular bricks were mostly shattered junk. The fly ash section came down in bigger chunks they could actually reuse. Changed my whole view, seeing those two piles side by side. Guess a little less strength is worth it if we're not burying tons of busted material.