Businesses and their needs change constantly and the toolings being used are constantly being developed to market needs as well. In an ever-changing environment, it can be appropriate at some point to reimplement a familiar toolset to get the most out of new or underused functionalities. 
As with onboardings, everything is scoped up front, so you don't get any surprises during the project. We ascertain which tooling you migrate from, what data needs transferring, go-live dates and come up with a clear project plan based on that.