I worked with Pivotal when I was at Sharethrough from 2010–2011. I’ve never seen a team move so fast. The focus was exhausting for the first week until I got used to it. Kind of like training for a marathon.
I’ve been at numerous startups since then and the teams have always been encumbered by technical debt and all the dysfunction that comes from not pairing. It’s unfortunate that intuition is so misleading on this subject. But that’s good for Pivotal, because it means they can make a lot of money saving people from the corners they’ve painted themselves into.