Yes I know this is from the Packer's but this kind of sums it up from people who know football....
Quality left tackle won't be easy for Green Bay Packers to find | greenbaypressgazette.com | Green Bay Press-Gazette
“You’re looking for a premium athlete at that left tackle spot,” Packers offensive coordinator Joe Philbin said this week. “If you’re doing draft work and you’re evaluating 45 linemen coming out, you’re looking for the cream of the crop,
in terms of balance, quickness out of the stance, length. You want to see a guy that can really stay on his feet, whether it be run or pass.
“Some of the great linemen that you see and I’ve been around, they can almost leave the game and their pants aren’t even dirty. That’s not a bad thing sometimes, because they’re playing the game on their feet and upright, and that doesn’t mean they’re not run-blocking guys — it just means they’re not flailing around out there in space. But that’s the premier position on the offensive line, so you’re looking at a lot of good physical The combination of which can prove extremely hard to find.
Teams try to counter a threat with a threat, so the left tackle must be athletic enough to set against those players in pass protection and strong enough at the point of attack to both anchor and generate movement in the run game. He also must fit the physical description — perhaps most important, the arm length (preferably 34 inches or more) to excel in pass protection — and be tough enough mentally to excel on an island.
But your right, I would much rather have non athletes on the line.