I kind of give the trackpad a pass, as it's not all that complex and most people end up using it for hours per day. It's a different case from doors and faucets

I kind of give the trackpad a pass, as it's not all that complex and most people end up using it for hours per day. It's a different case from doors and faucets that might be encountered by tens or hundreds of new people every day, who each only need to use it for a second or two. On the other hand, anyone with children can vouch for how dramatically more intuitive a touch screen is.