> But one of the best features of C is that you can mostly ignore the standard library and still enjoy "C the language", e.g. nobody ever choose C for its standard library ;)

C is one of the hardest languages to do this with given its anaemic dependency management.

> (also re UB etc...: use the mighty trio UBSAN, ASAN and TSAN!)

All of which will miss some cases, even in combination.