Its depends if you product is tech, or if your product uses tech. I.e. if you main risk is business risk and the tech is easy, vs if you main risk is tech risk and you business is easy.

If you main risk is business risk (I.e. most money go to marketing/ad), then you go shallow, and make sure that everything go smooth.

If your main risk is tech risk, than you should lead the way. I.e. to lead in a tech risk startups, you must be versed in the most risky tech, other wise, you will not be able to judge the technical decision, which might lead to your ruin.