Because making a lander that’s wider and lower like the Firefly one is simpler and you have to control attitude for the landing anyways. Making it not tip over is easier than making it spherical and unpacking it after landing. But IM apparently chose to do neither of the 2 options…
Difficult to get into or it, but assemble in orbit... Read Digital Apollo. The moon is rocky. Really really rocky. You need enough fuel/thrust for your remote sensing to idle while Houston proceses you options.
What if spherical comes up against a rock or crater wall as big as it is? Splat.
