Stakeholders can afford to rewrite some parts of their compilers to comply with the standards and cannot afford to rewrite other parts to comply with the standards because their customers rely on the existing implementation and/or because of core design decisions.

I was nodding along until here. Wouldn’t one, given the option, always choose, if possible, a compiler that doesn’t differ from the standard? And if that isn’t an option, wouldn’t it be up to said stakeholders to own the inconsistency?

Tough problem to solve for sure.