I imagine getting the trackpad right is either a giant pile of heuristic rules, or a nice tagged data set for ML, or both, maybe with a side of online learning

I imagine getting the trackpad right is either a giant pile of heuristic rules, or a nice tagged data set for ML, or both, maybe with a side of online learning from usage. A trackpad that automatically does the right thing for me coding, my 12 year old gaming, and my 8 year old with sloppy fine motor control does seem like rocket science to me.