This isn't a 1 vs the other issue. I'm a strong believer in 'one web' where the content comes first. However, there is a category of 'web app' where presentation is extremely important. If the content were to *arbitrarily* cause scrolling it would ruin the experience. Sometimes, You really want to lock down how the data is formated.
Take a calendar: it must be 7 days wide. The PURE one-web model would allow it to wrap. All I'm saying is that 'web apps' don't want to scroll arbitrarily, they want stronger editorial say in it's presentation. Can both exist on the web? Of course, I'm just saying some content is less tolerant to reformatting that others.