It's just an excuse not to use safe languages. And adopting it isn't that easy - one need to learn how the new library works or even rewrite old working and tested code with it.
This is a tragically misguided view. There are tons of code bases that aren't going to be rewritten in safe languages for various reasons, be it political or technical. You may or may not agree with those reasons, and you may or may not like that these code bases are important, but the fact remains that these projects exist. Giving them a toolset to adopt a broad set of bounds-safe behavior can only be a good thing.
It's not an excuse to write C forever, only because some embedded platforms have poor support in compilers other than GCC. Embedded developers should do something to force embedded vendors providing something better than a GCC fork or even something more obscure.