IIRC, it basically removes the need to do a handoff between the relatively tiny tanks that can reliably pump fuel and oxidizer in zero-g from the main tanks tha

IIRC, it basically removes the need to do a handoff between the relatively tiny tanks that can reliably pump fuel and oxidizer in zero-g from the main tanks that struggle with that in starship, and completely removes the need for any of that on the booster.