Look at window management. People have had to use third-party utilities for years to handle this function. Apple only provides a couple of ways to do it natively and they were very limited and rigid. People were constantly asking why Apple doesn’t include better window management. Windows has had this built in for several years. Finally, Apple did launch a window manager. Yes, it does the basics, but from what I’ve heard it is still fairly limited. It is likely that at least some of the third party tools will survive by providing more features and more options that appeal to advanced users who want more control or who don’t find the Apple solution to be a good fit.