Ironically, AngelList posted a slideshow the other day about how they don't use tests because they increase development time and make it hard to be agile. They instead iterate quickly, pushing out new versions and fixing rapidly as things come up.
The irony is that AngelList allegedly generates funding for real engineering teams.
So I agree with the general idea behind what AngelList is saying. If the startup value proposition is based on solving a "hard " engineering problem, OTOH, it's not such a good idea... but it seems that most problems startups tackle are NOT engineering problems.