of affairs. Be sure to select a tool that articulates how things are going but does not enforce a workflow; only the team can do that.
All of these tools are useful and, when utilized in concert, make the business of developing software much more effective. You can live without them, but their proper usage enhances your agility. Each supports but does not supplant your work. If you find yourself changing the way you work in order to support the tool, rather than because it makes sense development-wise, then you should re-evaluate whether the tool is right for you. Let your tools work for you, so you can focus on the “meat and potatoes” of software development.