It would be useful to create tools for existing codebases. For example ~10 years ago when i worked at a game company, we were considering C++ Builder to create

It would be useful to create tools for existing codebases. For example ~10 years ago when i worked at a game company, we were considering C++ Builder to create the tools for the engine because we could use the engine libraries directly (the engine was really a collection of many small libraries). However that idea was abandoned because C++ Builder at the time had very bad support for C++ (a few years ago they switched to Clang and modified it to use their C++ extensions, but that was too little too late - and AFAIK it wasn't 100% compatible with the previous compiler).