Chasing the shiny new also lends to version 1.0 types of problems. You would have designed it differently if you had just known that one thing you didn't totally understand. If you are working with your well known toolset you are much less likely to get the design wrong. Also not just using the shiny and new for each new project, the long lived project that has chased the shiny and new and has way too many shiny and new frameworks that have since been thrown on the trash-heap of development time.