Actually the "armor plating" is part of the problem...players can use their bodies as battering rams because of their helmets and pads....go back to leather helmets, and they'll start tacking the right way again. I also would impose weight limits on players....the game was better before the days of the 300+ lb behemoths. Good offensive line play is much more a function of good technique than size.
I could argue that with you because these 300+ pounders who play on the offensive lines are cat quick and they don't take a false step.
Now you are right about technique being what it's all about, But these guys are so damn quick off the snap.
Example Joe Gibs hogs and the counter trey which is still used today.
Lighter players and less “body armor” are both solved in the LFL - Lingere Football League. Or so I’ve been told....