Trackers allow note data to be annotated with various "effects", triggered via special codes. Some of these effects are things like pitch bends and filter adjustments, which can easily be done in any sequencer. However, effects like retriggering the current sample from an arbitrary offset or rapidly alternating notes in an arpeggio are fairly unique to the tracker workflow. It's not that you can't make those sounds in a conventional DAW, it's just that you probably wouldn't in practice.