> analogous conformance test suites exist and are run automatically
I'm not clear on how this is even possible. "Conformance" for C++ means adherence to the published ISO/IEC 14882 standard. In the case of Rust, it's "this is what the compiler does this week". Sure, a third party has built out a CI system for Rust and uses it provide evidence that Rust does what Rust does, but that's nothing similar to having evidence any random toolchain conforms to an accepted, published, international standard of what the C++ language does.
When it comes to providing test evidence for functional safety (for example ISO 26262 or IEC 61508) I can point to Perennial or Sold Sands results and say with confidence that my toolchain does what it says on the C++ box. When it comes to Rust, I can point to Ferrous and say "the core Rust language when built using rustc does what the rustc developers claimed it should do last week, excluding any crates or libraries." To which claim are you going to trust the lives of you and your loved ones?
They aren't analogous at all. There is just reams of marketing spin here and eventually it's going to kill someone.