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.
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.