Board Thread:Warhammer 40k General Discussion/@comment-24037808-20140924094901/@comment-192.138.82.196-20140924190857

To Attank's defense there were those among the primarch's (Russ and Dorn namely) that didn't like the tennets of the Codex especially the breakdown of the legion into chapters so it wasn't that it met with ZERO criticism.

At the same time, Guilliman had no way of knowing that 10000 years after the heresy nids and crons would show up.

Also, the point of the legion breakdown is that same reason you have a curcuit breaker in your home.

When it comes to technology, the codex had nothing to do with the Imperium's technological stagnation. That happened because of the Mechanicum's greed for tech and the ecclesiarchy's extreme devotion to worship of the Emperor as a God instead of devoting themselves to the Imperial Truth that the Emperor established at the beginning of the Great Crusade.