I really enjoyed that aspect too. I was an intern a few years ago, and at the end of my internship I sent out a 'shipped' email, with lots of positive feedback. It's easy to feel ignored as an intern, but Stripe at the time felt very cohesive.
In reply to foldr's comment, yes, they were totally optional (I can't imagine it's changed).
In reply to foldr's comment, yes, they were totally optional (I can't imagine it's changed).