Totally agreeing on this... of course, having AS makes me biased towards things with a clear structure so that could also explain it.I used trackers a few times. I actually found them really helpful for composing. Working inside repeating loops and branching off to other ones made me think in a very...."structured" way, I guess?
From my experiences, trackers lets you do more or less anything you want using envelopes and effects and stuff, they're easier to use than studio programs but also less powerful. Since they're already having the structure there for you, they're easier to learn, so people without formal music education can get into them easier. MIDI in itself is pretty useless, you need to use some soundfont-capable program to do anything meaningful with them, and a lot of those things completely drown you in buttons and controls everywhere.... so intimidating that I try to avoid them as much as possible in lieu of trackers. I don't see how anyone could use something like LMMS to compose music, you have almost no good overview of things like note timing and pitch, only streams of audio.