While compression is a wonderful tool for live instruments, and vocals especially, one of the cornerstones of mixing, it plays a different role in electronic music, because the volumes of notes are so much more predictable and consistent. The conventional use of compression, on a per track level, is to prevent surprising jumps in volume from a source. With electronics, unless something is wacky with them, the levels coming out are much more consistent, and don't need this kind of control, to sit in a mix.