Way back, Atari ST owners were practically always the MIDI guys & girls, and Amiga people used trackers (there was OctaMED for those who used trackers AND had MIDI gear but…). So I suppose it’s understandable / natural that as a ST user one wouldn’t have stumbled upon trackers too easily, considering ST had a very good MIDI support, software and ports built in, whereas Amiga’s sound chip was excellent for sample playback and people tended to capitalize on those.
(I know there have been both trackers for ST and “proper” MIDI sequencers for Amiga, but practically all MIDI studios I visited had a ST, and practically all demoscene / tracker musicians I knew had an Amiga and later possibly a PC with ST3/IT/FT2.)