Even long-term users of a computer system usually know and use only a tiny fraction of its available commands and features. If the design has good usability, people learn a core set of features fairly easily during their early days of system use. And then they stagnate and don't get much better. Decades can pass with even frequent system users barely learning one or two new things per year.
Stagnating user expertise is not limited to any particular design category. It's been documented for all classes of user interfaces across decades of research.
Stagnating user expertise is not limited to any particular design category. It's been documented for all classes of user interfaces across decades of research.
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