Lili Ermezei, Creative Strategy Director at Wonder Agency, makes the case in this terrific blog post that, "Being gritty is essential for successful design projects." I agree wholeheartedly. Some teams struggle during the design thinking process generate meaningful insights from their field research. They settle for conclusions and interpretations that are superficial. Others struggle because they converge too rapidly on a solution. They fail to gather and accept sufficient user feedback, and they don't iterate effectively.
Enlightened trial and error requires grit. You have to be able to persist despite multiple failed prototypes and experiments. You have to encounter numerous instances of negative feedback and persevere. Many people become frustrated with the non-linear nature of the design thinking process. Grit certainly helps in this messy process.