That poor guy at the end of the video looked like he hadn't slept in months...
What I took from the comment was that the ST in general was easier to code for because the OS was very basic. Even now, after having played with MiNT vs OS3.9 with a bunch of patches, libs, etc in both, MiNT is a much simpler system (but far less powerful as well). So there is always the trade off. One thing that has always bothered me... why did the Atari STs have an MMU but no multitasking (until much later) yet the Amigas did not, (until later) and yet had multitasking from the beginning...
