That's good advice. You probably got no response about adding guy points on the walls because it is a bad idea. The (formerly) Malibu Epic 1.6 oz fabric that BD used on that tent and its replacement is not strong enough to handle the stresses that a mid-panel anchor point would create. That is why the only guy line attachments on the BD tents are at the seams, and close to the ground to boot.
Take a look at the Bibler tents and you'll see that the mid-panel anchor points are reinforced. Trying to turn an ultralight BD tent into a 4-season Denali tent is like trying to drive a sports car across the Sahara Desert. In both cases you'll end up with a lot more holes in it than when you started.
duly noted Why spend all the money on over-priced brand name crap anyway? We all now know you can get a MalWart put tent, for like, $19.95. From what I've read here, it's pretty much functionally equavelant to most expensive, brand name tents all the wanna-bees buy to look cool...