That has sometimes been true, but for example C++ didn't have variadic macros, maybe still doesn't, because they were added to C after Microsoft decided to stop

That has sometimes been true, but for example C++ didn't have variadic macros, maybe still doesn't, because they were added to C after Microsoft decided to stop following C development. https://stackoverflow.com/a/21515839 https://stackoverflow.com/a/21515839 goes into details of other differences.