A great simplifier
I have already done this. I am a C++ Library designer and understand all the esoteric low-level details needed to write good libraries. I told my last employer that was my primary skill area. It turned out that they had already granted ownership of this space to someone else who viewed me as a career threat. The job did not work and I no longer work there. If they had paid attention to my resume and to my interviews, they would have realized that I was a poor candidate for the job and saved a lot of trouble for us all.