Matt Cutts has publicly condoned the use of PageRank sculpting on repeated occasions. Google has even used the technique on their own properties.
So my question to Shari is: "Have you ever conducted any testing of the PageRank sculpting technique?" We at Netconcepts have, and it works.
According to our tests, there are plenty of occasions where it can be a valuable tool, if used wisely. For example, if you have an ecommerce site and the category pages contain 3 links to every single product page -- the product name as a text link, the product image thumbnail as an image link, and the words "View Product" as a text link -- you could nofollow the image and "View Product" links and funnel more PageRank through the much more contextually-relevant product-name-based text links.
"I am always a fan of giving people more flexibility and more tools," Matt said in reference to giving "more flexibility to site owners to sculpt how they want to flow PageRank or to change how the page should be indexed" (quotes from my interview with him at PubCon, published on stephanspencer.com).
So if Shari wrote this piece without any testing, it's just unsubstantiated opinion -- and I wholeheartedly disagree with it.