Sketch-style UI isn't supposed to make people comment more freely, it's supposed to help stop them from focusing on the polish and instead look at the functiona

Sketch-style UI isn't supposed to make people comment more freely, it's supposed to help stop them from focusing on the polish and instead look at the functionality. The last thing you want is "X and Y aren't aligned" or "Would color Z be better?" when the questions are still more like "Does this work?" and "Are these numbers correct?"