Another anecdote: an expensive training class onsite in 1987 at a new Adobe Systems building in Silicon Valley, with Apple/Mac developers well-represented and a few financially successful developers from other OS. The whole class was halted ten minutes in because one of the non-Mac attendees realized the whole curriculum of "developing drivers for Adobe Postscript" was going to be presented using a point-and-click coursework, and called a senior contact at Adobe in to make a scene.. because, you know, a "mouse" ?