At the same time, a co-founder with a business sense and no sense will likely make bad business decisions that have technical impacts. Do they understand the t

At the same time, a co-founder with a business sense and no sense will likely make bad business decisions that have technical impacts. Do they understand the true cost of a highly available environment? Do they understand why feature development takes so long? Even people with a limited technical background make those. In fact, they're probably worse, because they think they understand something but really don't. Have two founders from different backgrounds, with a small understanding of the other is good. But the key is to understand their own knowledge boundaries and let the other take over where it matters. They need be able to play devils advocate to each other just enough to come up with the right solution.