Don was an Apple II kid, and he credits Apple with helping him dive so deep and so early into writing software. I never had an Apple II, but I got a taste of that kind of experience with the Vic-20 at home, and the BBC computer room at school.
But then, we upgraded our home computer to the Apple Mac. My experience on the Apple Mac was exactly opposite to Don’s on the Apple II.
The Mac was the start (well, after Lisa) of Apple’s focus on the creativity of the users of computers, rather than on the creativity of software developers. The Mac had amazing useability and rich interactive applications, but there was no out-of-the-box development environment. Even when years later I did get the MPW, there was a killer learning curve to create simple apps that conformed to Apple’s strict UI guidelines. Hypercard (especially Hypertalk) was ahead of its time and did encourage bespoke coding creativity, but then Apple ditched it.
Apple’s success is due to their user and customer focus, but ever since the Apple Mac they’ve been mostly hostile to developers.