Why isn't the normal of an edge the median between its adjacent faces?

Scenario 1, what determines the seemingly random angle of this line:

(Here’s how I’d expect the normals to orient:)

Scenario 2, again, what determines the random offset angle of this line:

2018-12-10_11-21-41

(Again, here’s what I would expect it to look:)

2018-12-10_11-22-54

Where does this random looking rotation to the edge normals, compared to its adjacent face(s) come from?

It’s really annoying to have to select a face and add a custom transform orientation and then go back to the edge, every time you want to make a normal transform operation on an edge.

It uses purely the edge, not any adjacent faces. This would be good to improve once.

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