We've been building race cars for a long time, but every time a new one is built they give it some test/practice laps before actually entering it into a race. That's all Artemis is doing is working out the kinks of the new space craft. There are larger plans now, and you can't go from ideation of plan to completion of plan in one attempt. Each Artemis mission is testing and moving towards the next step. The people involved in Apollo are no longer around, so a new generation of people need to gain experience. The Apollo spacecraft are also not being used, so new equipment is being put through the paces.

If you seriously believe that there's nothing new to learn from continuing to study the moon up close and in person, then you're just deliberately being obstinate about the subject. Humans are explorers, and the moon is just the next closest thing to explore. You're "won't stop talking about" comment is also just lame. If the 1400s explorers had decided that continuing to sail the seas looking for new routes or new lands was like having a friend that wouldn't stop talking about their childhood experiences, then the colonists would never have left Europe.

A racecar is an instrument of competition using the bearing of human capability though. Each variation of the car, track, and driver changes the ceiling and floor of how competitive the human can be. Space travel and satellite landing does not have enough participants to make a competition, and even if there were so much of it is not based on human capability in the moment but on preparations done beforehand. The launch conditions are very narrow and specific, the humans are merely there to monitor because they don't have the capability to micromanage to the degree needed the way computers do, and the variations that can be performed in operation are small and few in number. There's value in all of it and it is a huge accomplishment each time a satellite landing occurs, but the scale, resources, and planning required make it wasteful and asinine to turn it into a competition.