It&#x27;s all about churn. It&#x27;s new and shiny. Oh you actually depended on those features? You want document format portability? Those questions don&#x27;t enter the equation. Eventually they dump everything and replace it with something else. The quality varies from useful to bad, but ultimately it doesn&#x27;t matter to them, it all gets replaced eventually. Because new is better. Stability, backward compatibility, support for open document formats - these things don&#x27;t sell in Apple&#x27;s world view.