Some days the fish prefer nymphs, some days streamers, the odd day dry fly's. So...depends on the day to answer that question.
I do think though that a fish doesn't care how he is caught and no one method is more 'okay' than the other. A quick release is key in all situations.
I did watch the recent seminar and am guessing this question by Monger is influenced by that presentation.
Of note, the biologists indicated that a fish caught more than 1x a year will result in a declining fishery. They base that on a study by Jim Stelfox on little tiny Quirk Creek. Question: Is that number applicable to a larger river with such a healthy trout population such as the Bow?