So very much this. Around the end of the 1980s / start of the 1990s, all the big DOS apps switched their weird proprietary UIs out for CUA ones. Sometimes with

So very much this. Around the end of the 1980s / start of the 1990s, all the big DOS apps switched their weird proprietary UIs out for CUA ones. Sometimes with an option to go back, but not often. Sometimes with some of the old UI as well, but mostly, big-bang. And everything was better, the users adjusted, nobody ever looked back and we were all better off. Sadly the memo never reached the Unix world, and those terrible 1970s are now enshrined as holy writ.