If you ask why a compass is important, the honest answer depends on whether you're navigating a forest or just enjoy collecting compasses. The destiny number has a similar split: it's functionally important within numerology's own internal system, where it's one of several coordinates used to build a reading — and separately, it can be personally important to someone using it as a prompt for reflection.
What it isn't is important in the sense that, say, a blood pressure reading is important. Nothing about the letter-to-number arithmetic has been shown to track with real-world outcomes.
