You missed the point. Metamorphosis adds so much to shapeshifting the the existing builds stop mattering, and any existing build would just start using metamorphosis because of how much it adds. When extreme power creep is added to a build, it overshadows everything else. What mosaic and metamorphosis both do is add completely unique power creep to existing skills. It creates such an extreme imbalance between competing items that there is no longer competition. It’s a pure, textbook example of adding something that demolishes the health of the game for the affected skills and builds.