Importiant question about the necessary of progressions in f1-4 series

When you master an exercise you only do it as a warmup in the future, but once you complete the exercie you currently working on too master this exercies you used as a warmup no suddenly is not done at all anymore. So are you missing out on something here? In the end you are only doing the late step masterys and their respective warmups but what about the early stages, you just dont need too use them ever again?

Your warmup doesn't have to be the exercise you just mastered. Choose a smattering of previously mastered exercises, and change it up frequently for variety.