A fuel fat craft like that might be used to de-orbit other space junk then.
Instead of one big ISS, then in grabbing other bits---slowing down with a few puffs, releasing the debris to re-enter more quickly, then going on to the next item provided it isn't too far out of plane.
If released from Starship, this might be useful for something like ARM, or Space Force.
Like the LM, I would say this is among the first true spacecraft in terms of it not merely coasting once deployed. Most craft in orbit are pretty much stuck in plane--where this has a bit more agility.
This craft interests me more than Starship itself for now.