Some article websites (I’m looking at msn.com right now, as an example) show the first page or so of article content and then have a “Continue Reading” button, which you must click to see the rest of the article. This seems so ridiculous, from a UX perspective–I know how to scroll down to continue reading, so why hide the text and make me click a button, then have me scroll? Why has this become a fairly common practice?
You lose backwards compatibility with web browsers if you do that.
It also doesn’t help reader apps or plugins, SEO or various other things to have the site stream the text instead of just loading it.
Basically it moves you from standard thing everything understands to non-standard thing which might break. It’s just not worth it.