2.) It's something that Pop has never tried before
Popovich is not only the oldest coach in the NBA but also the longest-tenured coach, with 28 years with the Spurs. Generally speaking, older coaches tend to be set in their ways. However, Pop opting to throw lineup norms out of the window and going without a starting point guard is something that few, including me, expected him to do.
It shows that he is still willing to try new things and adapt to the ever-changing NBA. Not only that, but Pop has coached several great big men, including David Robinson, Tim Duncan, and Aldridge, leading some to expect him to try and change Wembanyama into more of a back-to-the-basket player. That clearly hasn't been the case thus far, with Wembanyama having the green light to play away from the basket and launch threes.
Once he gets stronger, he may spend more time in the post, but it's clear that Pop is willing to let his new franchise player play the way that is most comfortable for him. That will hopefully mean the end of the "[insert Spurs Hall of Famer here] is a system player" argument. With Pop playing big, it should also help the Spurs in another big area; more on that next.