Because Bezos would sue and get paid more for delivering a fraction of capacity and delay the project for a few years .
Boeing would be over budget and years behind schedule
It's an improvement over landing in the middle of the nearest village.
Not sure if there is any benefit from not having landing legs, a minor increase in payload to orbit.
I would have thought they could re-purpose the Lunar Starship and just park it back at the gateway, just need a big docking adapter. Park a few of them there and you'll have enough room to stretch your legs.
Sorry the question wasn't clear.
How quickly does the second stage need to accelerate to achieve orbit? Is there a minimum acceleration they need to achieve to prevent re-entry.?