I know nothing about malware, but I know a lot about shipping production software.<p>- Simpler is better than complicated. As pointed out in one of the comments on the article, increasing complexity increases risk of failure.<p>- Proven techniques are, uhh, proven. Newer techniques are inherently riskier.<p>- Really speculating here, but maybe impenetrable obfuscation was actually undesirable? I wonder if the authors, (seems to be Israel and/or US), wanted Iran to figure out who was behind it. A successful cyber-attack means that future attacks of the same sort are possible, and adds a bargaining chip to the Israeli/US side. This can lead to Iranian concessions down the road. Without a proven success, a similar negotiation tactic would have to be much more difficult.