You're making the mistake of equating a higher percentage of fat being burned in low intensity effort with MORE fat being burned. Not necessarily the case. There is ALWAYS more than one way of doing things and it is useful to keep in mind the effect on metabolism AFTER the cardio. The fact is even high intensity WEIGHT WORK has been shown to burn more fat throughout the day than low intensity work of anykind. So also with HIIT style "cardio".
Probably people should do what works for them. There is not usually a one size fits all in this, nor in diet. But I think a mix of both higher intensity and lower intensiy would be very useful. It wouldn't be possible to sum up the optimal approach to cardio for everyone in one thread. That's why we have a whole fat-loss forum
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For a clue as to what I'm talking about look up the term EPOC:
Excess Post-Excercise Oxygen Consumption.
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