I agree. I've worked at a company where the plan to migrate from a legacy system to the green architecture was planned to take a decade. With large systems, you

I agree. I've worked at a company where the plan to migrate from a legacy system to the green architecture was planned to take a decade. With large systems, you will always be in a state of flux. It's simply impossible to replace the entire system in one swoop. Libraries like this acknowledge the incremental nature of accepting a migration path over time.