How much did the choppy video and connection errors really cost Apple in terms of lost revenue or reputation? Testing their CDN performance using a world-wide bot network isn't cheap. Perhaps the decision makers did weigh the risks and rewards of thorough iterative testing, and the risk of their CDN not meeting SLAs or that demand exceeded capacity did not justify cost. Apple undoubtedly knew few customers would not upgrade just because they missed some live streaming hype so, assuming they did not test, that may have been a conscious business decision.