Javascript just made it very easy to add libraries. I bet you if it C++ had an ecosystem as easy to use as Javascript, it would be the wildest mess you could imagine. Someone would create a package chock full of generics that sends your credentials to a foreign server during compilation but output a completely fine binary. But making dependency management easy in C++ would kill the elitist allure to the language and we can't have that now, can we?

Every fucking language besides C++ has a proper package manager people use constantly. And conan exists for c++ if you want to push the definition of "proper"

Replace JS with ocaml Haskell anything dotnet java go rust python ruby etc. if you prefer.