It's simple: PDFs optimized for a given device are the best-looking and most usable format out there. PDFs optimized for a different device and screen size are the least usable and worst-looking format out there. They're generally either perfect or worthless with no middle ground. That's one reason so many people don't like PDFs - as the old Klingon (SFB version) Proverb says "Perfect is the enemy of good enough."
For many the difference between a good PDF and a reflowable format is not as great as that between an unsuitable PDF and a reflowable format. It's a matter of priorities: which is more important? Having the very best, or not having the very worst?
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