I wonder how well Apple has deployed these tools internally for security research.

Since mid-April Chrome showed 302 vulnerabilities patched, 225 of them found by Google. Same period last year was 19 vulnerabilities. They've also become more transparent recently, disclosing vulnerabilities found internally, not just externally (which Apple still doesn't appear to do). From the outside, it's hard to tell if Apple has deployed this tooling as much as Google.

I'd guess they haven't even begun to really utilize them. They've never been a terribly security conscious company, despite the marketing.