> The scrutiny applied to compilers are done by the compiler developers.

I apply scrutiny to Common Lisp compilers, and have done this for more than 20 years. I'm not a compiler developer. I don't even look under the hood, at the code of the implementations.

Instead, I run massive random testing. Billions and billions of randomly generated functions, thrown at the compiler to either try to get it to crash or to generate code that produces incorrect results (detected by differential testing with different settings or transformations that should preserve what is being computed.) It's a remarkably effective way to surface compiler bugs.