The missing context: I think that some of the practices used by startups are not inherently better but just performed in front of a much more tolerant and loving audience. If we are talking about big nasty systems full of legacy code - what's the point in rolling out code 5 times a day and making things marginally better. The time would be much better spent proving business value to the decision makers and doing one major refactoring of a core module that is making users miserable. And that takes time.