Huh. I have no idea what point you're trying to make.
Virtually everyone modifies Unreal C++ code. Some indie projects are blueprint only. But modifying the engine C++ source code is practically an expectation.
Can those source code modifications be easily shared with other developers? Well they can't be publicly dumped on GitHub. Can they be shipped to consume in a compiled binary? Absolutely.
Virtually everyone modifies Unreal C++ code. Some indie projects are blueprint only. But modifying the engine C++ source code is practically an expectation.
Can those source code modifications be easily shared with other developers? Well they can't be publicly dumped on GitHub. Can they be shipped to consume in a compiled binary? Absolutely.