Nobody here is contradicting the clean wing concept, just the fact that pilot inspecting all surfaces post de-icing is just not something that can realistically be done in many situations.
HOT can be sometimes as short as 10 or 15 minutes, depending on the conditions. If you can tell me how it is possible for a pilot to inspect all de-iced surfaces after de/anti-icing has been completed and still depart within the HOT period, I would be more than happy to learn something new.