Neither bias is either completely right or completely wrong. Most new ideas fail, so it's healthy to know critics who can help counterbalance creative enthusiasm and perhaps see potential pitfalls.
But new ideas—the right ones—are hugely valuable. I've heard creativity described as a tolerance for the cognitive dissonance—that is, the natural mental pain and discomfort—of combining unrelated or incongruent ideas. This process likely bothers a skeptical person a lot more and they tire or frustrate out earlier.
Less creative people can be difficult to brainstorm with because they don't enjoy the process and want to "get to the answer." But creative people can be difficult to execute with because seemingly everything at every moment is up for reinvention.
The point here is that we need people on both ends of the spectrum and they need to understand each other and the value they bring.