Over 25 years as a programmer, I've only seen some very jr developers (no industry experience), do this. It's unlikely to help you in getting the position, which is why it's rare.
Some nearly 15 years ago, one of my elders told me to do this. I was later told this was the reason they picked me over someone else. That's the story of how I got a job at a megacorp. In massive companies, HR people can feel really undervalued. In a sea of a dozen of equally qualified juniors, a hand written card can tip the scale. At least then. It wouldn't have moved me and I don't know when the last time an HR person got to be the final decision maker on a hire, but that's some context.
Maybe? It just seems like good manners. Don't overdo it but as an interviewer I don't expect an email but I'd find it very normal to receive a short polite one.
