Like a lot of C++ things there's a big theme of "can we have X? we have X at home. X at home: o_O"
They also have an advantage over cargo, specially Conan, binary repos, no need to recompile the world for 3rd party dependencies after each git clone.
Like a lot of C++ things there's a big theme of "can we have X? we have X at home. X at home: o_O"