I love how there are still dumb arguments here about trying to justify plot holes in an industry story written by a guy who has basically run out of experience.
It's still better than people who contemptuously dismiss people discussing the story as a few people here have done. One example is the person at the top of the page who claims that Tsubame, an "experienced programmer,"(in actuality, a talented newbie who's more experienced than Nene but less experienced than Umiko) "forgot" to test her code- more accurately, she did a half-hearted job, partly due to overconfidence-fueled carelessness and partly due to rushing. In that case, if she was convinced she wouldn't make a mistake and had a single-minded focus on getting done ASAP, it's only natural that she'd prioritize speed over quality.
To get things in a more positive direction, I personally liked this chapter, as it has a nice discussion of what it means to draw for someone else's approval, and shows that Catherine's other employees haven't given up on designing the King's Hand enemy just yet.