What 2 MB is good for
2 MB is a print-oriented size. A3 at 300 DPI needs roughly 3508 × 4961 pixels, about 17 megapixels, and 2 MB of well-compressed data renders that convincingly on paper.
It is also the practical size for photo book pages, where a spread is examined at close range and inspected far more carefully than a screen image ever is.