Oh yeah, no argument there. I was talking about, y'know competent cruiser drivers. Who don't drive their cruisers broadside-onto ten 140mms firing AP at under 7.6km.
The slightest angle can defeat those secs if you're driving a cruiser. Interestingly, they do more damage to angled destroyers, because they don't overpen. What I find they're relatively useless against are BBs, because they just bounce off unless you're close and they give you a broadside. And with all the Scharns and Gneises sailing around, you can't really close the range like you used to because torps.
Meanwhile, HE-firing secondaries on other ships can give you insane fire damage. Don't get me wrong, I love my Nagato and I acknowledge she would be OP at T7 if she fired a full HE secondary broadside.