It's not just a touch issue. Desktop environments have toast notifications and dialogs that can pop up unexpectedly (neither of which are remotely new problems). You can be trying to click something at the corner of your screen and have it intercepted by a notification or you can be pressing enter and have it activate the default action on a dialog that just popped up. Especially in the dialog case you often just have to hope that it wasn't actually something you needed to see or select a different option on.
Or apps like Skype which popup a dialog while you are typing, and when you where in the middle of pressing space while that happens, then you auto-answer a call you didn't know existed a second earlier.
