From a UX perspective, there are at least two kinds of nitpicking.
Everybody is familiar with the first kind. Most design reviews consist of people sitting around a table, criticizing every minute visual design choice, from type selection to button sizes.
This type of nitpicking sucks the life out of most creative people without adding any significant value in exchange.
The other type of nitpicking involves teasing out nuance. In this type of nitpicking, team members ask pointed questions to uncover a design’s implicit assumptions.
This type of nitpicking adds value, and the best designers thrive on it because it helps them see problems in new and interesting ways.