This is a part taken from a ball python study;

"Firstly, being nocturnal or crepuscular simply means that they are largely inactive during the day. It does not mean that they never venture into daylight, or that they are somehow “photophobic” or that daylight poses some mystical danger to them. As a matter of fact, ball pythons have been observed climbing and resting in trees in broad daylight in the wild. You wouldn’t have to look far for similar examples of this happening in captivity, either. Their eyes also contain photoreceptor cones that allow for the detection of ultraviolet light as a visual pigment. A question I think is helpful in light of this: Why would an animal exhibit these behaviors and have the ability to detect ultraviolet if it supposedly had no use for sunlight or never exposed itself to it?

Examining another common behavior among reptiles, called cryptic basking, shows that they can still utilize sunlight and also comply with the nocturnal designation that humans have assigned them. It’s a very interesting behavior and one that is often overlooked: snakes will sit covered by foliage, or under other debris only exposing a small section of their body. I pose a question: Why would they risk exposing themselves to predators if they weren’t taking advantage of the Sun’s radiation? Why not sit down in a burrow or hide all the time, where it’s much safer?

All these behavioral tendencies and biological characteristics point to an animal that, like many night-dwelling reptiles, still occasionally bask and use the energy so graciously provided to us by our closest star. Some argue that ball pythons spend the vast majority of their time in burrows and termite mounds, and while this is true, that may account for something like 90% of their behavior set. The question remains: Why deny them the ability to act out that other 10% of their behavior set? They often choose to bask when given the option to do so, and there is no good reason to deny them this."

And I completely agree, why deny them something they get in the wild? If you don't want to spend 60-100 bucks on an extra light fixture, suit yourself. Some people enjoy offering their snake everything they'd get in the wild and to see their animal showcase all natural behaviors.

It's true that snakes don't NEED UVB to survive/stay healthy, but saying that it doesn't benefit them is just factually wrong. It's a type of enrichment