The vast majority of people outside of Unix-adjacent computing have never heard of, much less used, emacs. More broadly, most people have never used any form of

The vast majority of people outside of Unix-adjacent computing have never heard of, much less used, emacs. More broadly, most people have never used any form of REPL, including the handy PowerShell that has come out of the box with Windows for a good decade now. This app succeeds because the developer has hit upon an interface that better matches normal users' mental models around calculators.