As a technical founder/early person in my past:

If you don't know why you need a technical founder. That is EXACTLY why you need one.

It is the same reason why if as a technical founder, I didn't know why I needed a non-technical founder. I'd probably be making a major error.

To those saying they waste equity:

If you truly have a failed company, with a bad founder, buy them out or kill the firm, it happens. You've learned some key lessons.

If the founders you need cost you 75% of your equity and you make a unicorn.... Were they worth it? Who cares. You got your fuck you money.