Comment by ssl-3

Fuses can vary a lot -- even amongst examples with the same ratings, from the same box (and presumably, the same production batch).

Dave Jones of EEVBlog fame did some experiments with this several years ago: https://www.youtube.com/watch?v=WG11rVcMOnY

(I'm not arguing for or against any concept here; I'm just presenting some non-datasheet data.)