I've seen it like that before because it gives hiring managers scope to create different types of job. They might have to hunt for talent at a certain price/res

I've seen it like that before because it gives hiring managers scope to create different types of job. They might have to hunt for talent at a certain price/responsibility point, but having extra steps on the scale downward allows them to open up a position at a lower price point if needs must. If that rung didn't exist, it's be a much harder ask to get a JD approved in a large co. Also, a number of places need a few spine points below someone's normal band for probationary periods (I once started a role at a lower salary and they bumped me up to my real one on probation pass), or other reasons. Most of it comes down to internal processes for job creation and sign off.