It doesn't refute that Westfield Valley Fair is booming and bustling, since the renovation. I live in Santa Clara like 1 mile from Valley Fair, and visit frequently to shop for gifts. Subtly, completing the renovation improved the pedestrian circulation in the mall, there aren't dead-end wings now.
Valley Fair is very busy, like many people there on any weekend and most evenings, but not inconveniently so. Busier than any other commercial venue I've seen post-pandemic. On weekends some restaurants there have long lines that I don't understand to wait in, I'll go eat later at a neighborhood restaurant.
The slow driving traffic that I've encountered is when I leave at 9pm when the mall closes and there is mass exit. I could the 1 mile too, or bike or scooter, but I often drive.