As you grow as a developer (and development leader) and you work with more and more technologies over time in different projects, you start to realize how easy it is for the team to get more focused on the challenging technical problems than the actual product issues. Ignoring the product issues will kill the product (and possibly the company). With limited attention (he calls them innovation credits), it is best to put your effort into innovations that can differentiate your product. All too often, teams get more focused on the next cool technologies, turning everything into a nail as the old saying goes.
Dan McKinley does a great job explaining this in his talk below.