Implementing an undo feature is certainly harder than just providing a popup, but I think at least for me using a popup is a reflex and we should at least think

Implementing an undo feature is certainly harder than just providing a popup, but I think at least for me using a popup is a reflex and we should at least think about using an undo feature. I agree with the author that habitual responses to dialogue buttons can be dangerous, so I suggest considering this on a case-by-case basis - not just as to whether it's worth the money, but whether it will significantly reduce user distress.