Myself, when I saw this, I imagined that instead of this "spraying" approach, you could build a very flat lander, basically a large metal disk with some propuls

Myself, when I saw this, I imagined that instead of this "spraying" approach, you could build a very flat lander, basically a large metal disk with some propulsion and support structure beneath it, and drop it just ahead of your "real" lander. Then you'd get a firm platform to land on mere tens of seconds later.