One of the stupidiest things you can do with text is to reveal it on scroll. What is it? A designer thinks plain text is boring? This article desperately needs animations, but there’s nothing to animate but text? Text in a book isn’t animated, and last time I checked, books are doing just fine.
Web sites are already suffering from loading delay that varies from 0.5 to tens of seconds. Such delays make things much less usable than they could’ve been. You can scroll through the whole book in a couple of seconds looking for a picture you need. It’s not a big deal. Imagine going through 500 web pages. How much time would it take? How soon will you abandon that idea? Very few people are patient enough to check even second page of Google.
Make things instant where they can be. Instant response goes a long way, always.