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Denominator, go Mercator
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This is a science community. We use the Dawkins definition of meme.
It may not be the intended purpose but I certainly does change how the world is seen by everyone using it to warp the mind's eye to how the world actually physically is.
Edit: Does it do an excellent job for navigational purposes if you are shipping from Japan to Brazil or it it only excellent for shipping from the northern hemisphere to the northern hemisphere?
Do you seriously think that the geometrical properties of the projection change below the equator? You need to learn yourself some geometry.
It works for any shipping lines
https://en.wikipedia.org/wiki/Mercator_projection
Perhaps if they are unaware that a 3D image of a geoid projected onto a 2D plane can cause issues, however every projection will have its own failings whether area, shape or directional (angular). Familiarity also comes into play, and i believe that is more at the root of the issue you bring up.
As for your navigational questions, this Reddit thread may be helpful https://www.reddit.com/r/explainlikeimfive/comments/4s4869/eli5_how_mercator_projections_are_better_for/