Speed. Simplicity. Silence the noise.
However, on macOS, this actually works in its favor. Because QM is generally lightweight (often a simple native binary or a Java-based terminal that respects system fonts), it feels incredibly snappy. On a MacBook Air or Pro, QM is a negligible resource footprint. It does not spin up the fans; it does not drain the battery. It sits there, waiting for input, hearkening back to an era where computing was about instruction execution, not animation.