Put yourself in the shoes of the developer of a midi sequencer in the 80s. You could target the Atari, where midi ports are standard and everyone with an interest in music is a potential customer. Or you can target the Amiga where there’s no standard, effectively forcing you to source or develop a midi dongle yourself to sell with the software, increasing the price by at least $20 or $30, and adding complexity and development costs up front.
That's a good point. Something being a noted feature of the device would encourage people to develop software for it. The DSP in the Atari Falcon was a big draw as well.
