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While we have that feature coming too, in short, there are many cases where we want to see the whole world at once. Expanded on this in a comment earlier: https://news.ycombinator.com/item?id=29541230

I think this would be by far the most intuitive, and less jarring, so it's a very good point. Show a globe on the world scale and fade over (unnoticeably) to an angle preserving projection when viewing city level.

A perspective projection (or an orthographic projection) is just one specific choice of projection, and for any particular use case it falls somewhere between suboptimal and entirely unsuitable.

Its one advantage is that it demonstrates that the map is a picture of a spherical earth, but it shows only one hemisphere or less, and is heavily distorted away from the center