The ST ate everyone else's lunch (in the DAW world) because it had built-in MIDI.

In a world where the Amiga didn't need an external MIDI interface, I suspect things would have been different.

Well, they did have Creator which went on to become Pro Tools. As I recall, its big thing was MIDI sequencing whereas the stuff for the Amiga was more content creation-oriented. Add in the fact that the Atari ST was cheaper and I guess that was that!

It did. Reasons are

1. Built-in MIDI interface.

2. High-resolution screen available, 640x400, 60Hz monochrome.

3. Simplistic operating system, the DAW software had 100% control of all hardware and timings.