Um, a CEO should champion a direction and a vision much less than an implementation. The job of the CEO is to make sure everybody can do their job, the bills are paid, the company grows, etc. To run the company, not to build the tech stack.

Also, responsive design is fine, but it's not perfect by any means. It adds cost, it adds complexity, and it isn't always the best interface to reach the end users.

There is upside to responsive design, but it's not magic and it shouldn't be touted as some kind of panacea to all things.