My take:

It’s a big deal that we’re going back because the massive expense and focus of the first go was unsustainable and bespoke. Today, with entirely new systems, new payloads, and loftier goals, we seek sustainable back and forth travel and establishment of an outpost. The math is easy now, yes. Getting there is known, yes. But this is still different. Put another way, how much time passed between the discovery of the new world by the ships of Spain and it becoming mundane, inexpensive and commonplace to pass from europe to the new world?