Earlier quoted context omitted.
Tidalcycles actually runs SuperCollider as its sound backend, through the SuperDirt library: https://github.com/musikinformatik/SuperDirt/
Nice! But why shouldn't I just use SuperCollider directly?
TidalCycles does offer a lot of ways to control the timbre -- there are a bunch of effects, including some magical granular stuff. And merely triggering samples at sufficiently high frequencies, particularly frequencies that vary over time, can generate some cool sounds. But SC will give you much more control over that kind of thing.