The amount of bugs like this, specifically lock screen evasion bugs, bug also disk management bugs we've seen, etc. As I said, this is not specific to Apple. The whole industry lacks security awareness, and because people don't hold these companies accountable, there is little financial incentive to change that.
Your specific claim was that Apple has "zero secure coding training, zero push for security reviews, zero push for security QA, zero accountability"–this isn't true at all. Sure, Apple's software has had some serious bugs in it, but this does not mean that they have no security practices in place.
I am not speaking about dedicated security teams. What security training is there for end-user app developers at Apple? From discussions with developers I know, it doesn't seem to exist, or at least not spread everywhere.
Maybe it's not enough for your satisfaction, but there are resources available for writing safe and secure code (I'm not sure if this is required, though), as well as regular audits by the security team.
I come from a security background (6 years in a security firm), and I have seen some pretty paranoid practices. I do not wish that to be prevalent. One thing which I really did appreciate in that firm, and find very valuable, was putting every developer and product person on a security awareness and secure coding course, where basics are taught, but also an attempt is made to push a security-first mindset.
I am now in a consumer-oriented company, and while I appreciate the much more relaxed environment, I am often shocked at how no attention or thought is paid to security. It baffles me that management, at the very least, has little care for this stuff.
What makes you think this?