If you can convince him to use Control Flow Guard, Stack Canaries, and HE-ALSR then you should be nominated for for whatever the security community has as an equivalent to a Nobel prize.
If you can convince him to get rid of his custom garbage Stdlib replacements and use ISO C++ then you're a hero to maintainability (and would probably improve the performance because the stdlib has move support).
If you can convince him to get rid of his custom garbage Stdlib replacements and use ISO C++ then you're a hero to maintainability (and would probably improve the performance because the stdlib has move support).