The answer to your question is not an easy one. It can be difficult to make everything look great on every device. That may account for the vague answer.
A book containing large images may be great on newer and larger device, but be a really slow slug on an older, but still ubiquitous reader. Color is only 16 shades of gray on an e-ink reader, and colors visible on a color reader may be invisible in grayscale.
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