Yeah, that suit is amazing!

Taking off from the moon would still require less fuel than taking off from Earth. That would allow the spacecraft to have a lot more fuel to get to Mars and maneuver once there.

Also, they could launch a craft from the moon to refuel the craft headed for Mars, further reducing their fuel consumption. There are a few ways to skin that cat and make the trip to Mars easier and safer. In space travel, easier and safer seems like a pretty good idea to me.

You realize the majority of fuel rockets use is just to break earth's gravity, right? Having a spaceship gas station on the moon seems like a pretty big win to me.