MSVC's experimental `/experimental:constevalVfuncNoVtable` compiler flag violates C++20 standards by omitting vtable pointers from polymorphic types with consteval-only virtual functions, causing type traits like `is_polymorphic` to incorrectly report false and breaking RTTI conformance, while the conforming `/experimental:constevalVfuncVtable` flag matches GCC and Clang behavior.
A critical analysis arguing that C++26's new safety features (constexpr evaluation, contracts, standard library hardening) are insufficient responses to the memory safety crisis, and that the framing overstates their real-world impact—particularly regarding opt-in safety mechanisms and the misuse of the CrowdStrike incident and 70% vulnerability statistic as motivation.