C++ builds are extremely slow because they are not correct.

I'm doing a migration of a large codebase from local builds to remote execution and I constantly have bugs with mystery shared library dependencies implicitly pulled from the environment.

This is extremely tricky because if you run an executable without its shared library, you get "file not found" with no explanation. Even AI doesn't understand this error.

The Mars Polar Lander and Mars Climate Orbiter missions would beg to differ.

(And "absolute" or other adjectives don't qualify "correctness"... it simply is or isn't.)