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Exactly, Lemurion. We want anti-aliasing algorithms in our e-ink devices--that's what results in smoother-looking fonts on screen. However, some people feel that it makes the fonts look slightly blurry, which it does to a certain degree. But that's part of why it perceptually is smoother, and less jagged.
Also, if a PDF uses an embedded (or subsetted) font, each character is rendered on-screen using the vector outlines of the glyphs. Most renderers use anti-aliasing algorithms to apply different levels of gray to best approximate those smooth curves. You really only deal with the "fuzziness" you describe if the PDF was created from scanned pages, as opposed to being properly created or distilled from a layout program.
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