Surely >95% of screens out there right now are running at 60Hz, so 240Hz "pen drawing" is pretty niche and not a priority?
I expect a screen that supports or is designed for pen drawing to be somewhat more likely to be above 60Hz. All of these things are niche things that not many care about, but in any case, it’d be nice to be able to do better. And like with Formula 1 race cars, benefits from high-end techniques tend to trickle down to other more mainstream targets in time.