Sim racing isn't necessarily too quirky or obscure but I do it to maintain some sort of maybe possibly ADHD. Doing laps around a track really helps with getting myself used to focusing.
It's especially helpful because each lap around a race track tends to be only 1 - 2 minutes, which is a relatively easy amount of time to keep focus at any one point in time, but keeping it up for consecutive laps and remaining consistent as time builds up in small increments is a different kind of joy to me.
Hahaha unfortunately Circuit de la Sarthe is my absolute limit when it comes to track length, though even on the Mulsanne Straight I end up spacing out. It's like a mini break
I am also a person with ADHD who uses sim racing as a form of meditation. I think motorsport requires processing a lot of information very quickly, so its one of the few things that can fully occupy my overly busy mind.
I've been dabbling in that for the past couple of weeks with my VR kit and it's pretty fun. I don't have a wheel, but I turned down the steering sensitivity enough on my PS4 controller that I could actually win some races in Asseto Corsa. If you haven't tried it in VR I would highly recommend it if you get the chance. Hauling ass in racecars I could never afford with the 3D realism but no real danger is great.