Comment by MBCook

> FWIW, I presume this is "from experience"--rather than, from first principles, which is how it comes off

I interpreted that as what they came up with when first looking at/starting to implement MTE, not their plan since $longTimeAgo.

Apple has certainly gotten better about security, and I suspect things like what you listed are a big part of why. They were clearly forced to learn a lot by jailbreakers.