The simples answer is that many orgs have accumulated megatons of high quality production code that cost them unknown billions in total to create and that runs

The simples answer is that many orgs have accumulated megatons of high quality production code that cost them unknown billions in total to create and that runs half of the world. Throwing it away is insanity. Hence need to improve on what is already available. Also not everyone believes in silver bullets and modern C++ is fairly god and easy enough to use. Just do not try to know ALL of the C++. This kind of expertise is needed by whole 2.5 people. Partially true for any complex enough language. You are still more than welcome to start new projects in whatever language warms up your heart or rewrite already existing stuff. P.S. I do not ever downvote post no matter what does it say.