A lot of people kwows how to write. Less people know how to use autocad.

As said it looks like you don’t have a clear idea how science and engineering work.

“Someone else’s idea” is the idea of scientists and engineers. They are the people who have the ideas, design products and implement ideas. Products are created by them. There is no suit who come up with ideas, and you cannot replace scientists and engineers with suits. Considering them as easily replaceable is the way companies fail. This is the reason their contracts come with more perks and benefits than other positions. You could compare them to writers, directors and crew members in a movie. What science and tech are missing are actors. The 2 guys you mentioned are more comparable to actors than writers.

That said, scientist and engineers deserve a piece of long term profits of the products they contributed creating, similarly as writers. Unfortunately they don’t have strong unions as writers… But they should