The technical capacity of a CTO matters less then the CTOs ability to stay in their lane (for a lack of a better term).

I once worked for a company with a self taught CTO (and not the good kind). They had a number of star players, and this CTO would frequently lash out at them. All because he was getting in the way of them doing their jobs, doing work he wasn't qualified to do, trying forcing them to clean up after him, and then yelling at them for it. It was insanely toxic. I only lasted a few months. It was so bad I back channelled patches and project briefs to people he liked to get them approved.

Had this CTO remained people, project and product focused everything would have been fine.