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.
If I were building a team from scratch, I would start by finding the best offensive line coach in the business and pay him whatever he wants. A good offensive line makes any team a contender, regardless of what they have at the skill positions.