I’ve built half a dozen sites over the past year or two that amount to a lot of information and pages on a single scrolling single page. My gut has always been that this isn’t great for SEO, but never had an article or data to back it up that was not just anecdotal.
The article below starts to shed some light on it.
I stand by my traditional web design/dev belief that search engines like large-well written sites where topics are specialized and specific across pages.