From Usability Geek: https://usabilitygeek.com/difficulty-not-ux-dirty-word
Typically, “difficulty” would not be synonymous with usability. It does, however, have an essential place in designing a great user experience. Sometimes, increasing the time and trouble required to complete an action is beneficial for the user. At times, we need difficulty to slow us down; to make us either consider or confirm a key […]