Another example of a wide, tooth-less, polished edge failing to cut as expected would be the skin on a tomato. WTH?
I guess that mirror edge is better to push across very tiny amounts of material like single hairs. If amount of material is more than a hair, then toothy edge is better.
You will not saw tree trunk with very sharp mirror edge blade. Tomato skin is like a tree trunk comparing with tiny hair. You better saw it up with toothy edge.
Another difference is direction. When material goes accross the blade like in chopping, then mirror straight edge is better. When material goes along the blade like in slicing, then toothy edge is better.