But, I'll take a triangle over a square any day. There is a lightly framed corn crib I pass every day, no bracing, vertical framing and horizontal skip sheathing. It leans about 18" this year as each board has let it drift from square to paralellogram. Next big snow will take it. I'd figure its lasted 50-75 years. It can take awhile for a flaw to creep enough to show itself. Each degree out puts it under more stress which will make it lean more and put it under more stress until... It's always worth thinking about.
