Part of Englebart's great demo was about how they'd designed different kinds of interfaces for adults and children. Adults would have sequences of (chorded keyb

Part of Englebart's great demo was about how they'd designed different kinds of interfaces for adults and children. Adults would have sequences of (chorded keyboard) commands that they could learn to do work rapidly. Children would have UI like is ubiquitous today - it could be explored and would be discoverable. I never knew what research that was based on, but it sounds like you'd prefer the grown-up experience that most companies just don't make. The closest we see are hotkeys for things like Office or our IDEs, but those can lack consistency from one version to the next and certainly from one piece of software to the next.