I worked at a company run by a SWEngineer.

He was code-smart for code, but really bad for business.

You need to get a real CEO who does management, but keep that person in firm check by mandating half the board be stacked by engineers. Even as advisory roles, like if your company makes widgets you should have some Serious Fucking widget people dominating the board for big decisions.

"You make one thing" is like "you had one job."

(And if you make two things so disparate, spin one off into a sub)