Some people say that the tools are primitive, especially the cropping feature, which is downright imprecise. That one in particular is something we definitely want to improve, and we even intended to make it more powerful before we shipped the app but we ran out of time. We also left it as it was because we saw something really interesting in our beta testing that informed our whole attitude towards creative tools: imprecision is liberating. No one who tried to use Mixel’s crop tool to cut out a foreground image from its background ever felt that they were somehow “not using it right.” The tool is so rough and inexact that people believe there’s really no getting it wrong.
Khoi Vinh about Mixel and Primitive Tools.