I'm trying to think of examples of trying this for C or C++.
* Batteries-Included Standard Library - can't actually be a standard library, but could be the next best thing, a widely-used library; things like NSPR and APR for C, or Boost for C++
* Third-Party Package Repositories - Conan, which seems to be healthy, but hasn't taken over the world
* Documentation - Doxygen, which has been very successful
* Write Once, Run Most Places - little progress towards this for C, but the people in the C++ standards process do at least think about portability; i think there is an inherent tension between portability and being close to the metal which means it is always going to be a lower priority for C or C++
* Package Managers - see under 'Third-Party Package Repositories'; not clear to me to what extent this is a different thing
* Code Formatters - these have long existed, i suspect clang-format is most popular, but it is far from universal; what's missing is a universally-accepted strict formatting standard, as found in Go and Rust, and arguably now Python
So, it seems that these things do get retrofitted, and do get adopted, but not to the same extent as if they were there from the beginning of the language.