When you’re getting started, one of the best ways to save time is by using the tools you know. It’s important to maintain a modern tool set, but the latest shiny tools are no substitute for the ability to iterate and ship quickly.
Once things get rolling, prioritization will haunt you. How do you know you’re working on the right thing when you have endless choices? Development? Design? Writing? Research? Support? Help documents? Marketing? Refactoring? Performance? Security? It’s difficult, so you absolutely need a framework to help you make the right decisions.