Not sure where the incubator you visited was, but I'd say mainstream view in Silicon Valley is that most teams need a technical cofounder (unless the startup just isn't technical at all). If anything, it's sometimes the other extreme: people will claim that technical cofounders don't need business cofounders.

That said, since it is so difficult to find technical cofounders, some teams end up outsourcing technical work out of necessity (not because they don't want to share equity).