That study makes sense given that it's about virtual keyboards, and most users expect keyboards to be act on press (since physical keyboards are). The issue, fo

That study makes sense given that it's about virtual keyboards, and most users expect keyboards to be act on press (since physical keyboards are). The issue, for me, is that he's extrapolating from that study that all (or nearly all) systems should be act on press, which doesn't actually follow. You'd need a study showing that subverting user expectations (act on release) by switching to act on press reduces error rates (or at least doesn't increase them). Take a web browser and make every click (even those intended to be a click and drag, like to a bookmark folder) act on press. See how much more often (or not) users use the back button for browser history, for instance.