I had this thought when working with a legacy app the company was migrating to a modern platform. The legacy app was enormously complex and contained huge amounts of business logic. Migrating it didn't get rid of all that business logic. Now, using modern software patterns inside a framework with it's own complexities, it was a lot more organised but perhaps even more complex thanks to business logic now needing to fit inside the frameworks idioms and structures. It was nicer to read through, but no less complex.