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frame is only too small when the rider is hitting his ribs with his knees whilst cycling
anything before that is just more aero
too aggressive for road riding, open to debate - but riders go smaller frames these days

Not only these days, its a practice that starts almost since the development
of the well manufactured 12-14 quill stems. Using smaller triangles you gain a stiffer frame with less weight.
I don't know why some cyclists see the offset on seat posts as a fault.
I always try to set my saddle as close as the legth of my legs allow to
the vertical that defined by the rear wheel axle and i always prefer 12-13cm stems instead of 10cm.

Of course you have to find the geometry that gives you the head tube
height that you need depending on your riding style.