Because many small steps are required before every giant leap.

I would like to point out that the current misadventure in the ME has cost at least $38,035,856,006 in 32 days. And that won't receive half of the "this is a waste of money" critiques this mission will. And there are a ton of people who are against that excursion.

Most people who will come across this will react with either extreme negativity or indifference. Very few people will react positively. This thread itself is evidence of that. This is a nerdy community filled with people who are deeply positive about space exploration and excluding my comments, the straw poll was,

    ~81 positive (48%), ~43 negative (25%), ~45 neutral (27%).

> How does any of that matter for this mission

This is a fair question. The closest answer I can get is eyes and ears onboard complement sensors.

To test the stuff that will allow to land humans on the moon