I often need to change languages during my workday because I speak French and English. The idea is to have two shortcuts: FN, which lets me speak French and get an French output; and FN-Z, which lets me get an English output.
This feature is present in some competitors like VoiceDash and I love using it personally; it's really a game changer. It's the only feature that doesn't allow me to use Blip full-time.