I think they plan to add some intermediate rewards in the future, as far as I understood from reading their roadmap post, so that's why they designed this feature. If they don't add those, this feature is absolutely useless, we already knew from progress page how much points we need for the next step, we didn't need a percentage scale to show us. Instead of this confusing feature, they should have added a page to show us how many points we need to step into the next bracket (50%, 25%, 10%, 5%, 1%). This was actually requested by many players.
I try to see the good side though, things finally started moving. Unlike Europe/US teams, Japan team seems to be working on something else other than new heroes/new chapters/new rarities.