OK fair point, but remember minimal requirements are guidelines only. As long as enough fluid is sprayed to remove ALL contamination from surfaces then that should be sufficient.
At my employer, maintenance also perform de-icing. You'll be amazed how little fluid you can get away with, especially if only spraying to remove frost on the upper surface of an outboard fuel tank etc.
Like people have said, every situation will be different depending on aircraft type, contamination type & level and weather.