Some musicians think like programmers and writing with characters in columns and rows is as comfortable as writing notes on a staff. That’s why there are trackers that output MIDI events and even a tracker based DAW (Renoise.) I’ve known musicians who considered their own use of trackers to be a kind of ‘cheating’ because it was so much more comfortable to use a tracker and churn something out vs say, performing and fixing it in a piano roll.

For some platforms, tracking is also much closer to what is actually happening with how sounds are triggered versus the effects vs the event based aspect of MIDI.