He ran around his idea, and I think the phrasing made the whole thing confusing. I guess he's saying that at this point sproutcore can't be thrown at a "template" view (as in, pre-built, possibly even a legacy view from another architecture) and make it perform better immediately. There's no way he could say that markup and a slim, fast and stable JS api can't be done.

TL;DR: it takes a bit of work to make sproutcore perform. Don't throw your current html at it in hopes it does better than everyone else (yet).