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by Tautologistics 5755 days ago
It does not remove the visual processing step, it simply reduces the amount of visual processing required.

Eyes tend to automatically fixate on motion. When the whole page transitions the eye has no single point of change/motion to fix on and must scan the whole page to identify the shapes that represent a login form. With a dropdown, the only change/movement is the login form, which the eye is naturally drawn to.