Interestingly, there are more use cases for hysteresis in UI design, e.g. it was famously used in nested menus in Windows: https://www.mackido.com/Interface/hysteresis.html
I think there was also an article about it on The Old New Thing, but I can't seem to find it anymore.
Like the HN post we're commenting on, so too does this example also get regurgitated every few years.
Find modern examples by Googling "menu safe triangle." Here's one from 5 days ago https://www.framer.com/blog/cursor-trajectory/
> I asked the Framer Agent to fix it, and within minutes it had built and applied what I now call trajectory-based menu aim