This is a good point.
When I played and "my hand got hot" my confidence went up which imo helps my shot.
When I'm not feeling confident and I'm hesitant to shoot I shoot worse. And vice versa
How does confidence change the mechanics of the shot? Ingles shot something like 43% from the three. He worked all summer on his shot, and that increased his percentage a tiny bit. Has little to do with confidence, unless confidence is something that adds 2% to your shot, which you wouldn't be able to tell without looking at stats.
Sometimes player will hit a bunch in a row, other times they'll miss a bunch. As players are just human, they have poor natural understanding of statistics. So they attribute normal statistical distribution with being on or off on any particular night.
Now I might be wrong. But as far as I know, nobody has been able to provide good evidence for the hot hand. However, given how widespread belief in the hot hand is, you'd think it's been confirmed by data ten times over.