He’s proved that an well-behaved, codesigned app can list file metadata about files in restricted directories. He hasn’t proven the sandbox compromised.
You claim he has so much serious evidence, link us there. Don’t just string adjectives together.
I have great respect for Jeff, but he is one of the more outspoken complainant Apple devs. At least he has a better basis for his commentary than DHH.
I would like Apple to not roll out BS prompts that make my life more difficult until those prompts are actually capable of protecting some of the most sensitive data on my machine.
I.e. His goal is to criticize Apple no matter what they do, because he dislikes the fact that they are no longer producing the kind of open system he prefers.
There are an enormous number of protections and a small number of issues, which do eventually get fixed, and of course the threats are undeniable.
However you are right that Apple is notoriously had at communicating about bugs.
This is a serious stance of his, with a lot of serious data and arguments to back it up, from a serious engineer who has written an impressive list of Mac software both for Apple and for Apple's customers.