To be fair, I think that the transition is still ongoing. On Android side, the support lib fell really short last year with Lollipop. You could implement a lo

To be fair, I think that the transition is still ongoing. On Android side, the support lib fell really short last year with Lollipop. You could implement a lot of material goodness, but had to do 90% of the work yourself. Something like a collapsing ActionBar is clearly doable but needs some time that won't be devoted to polishing other parts of the app. Another consequence is that since there was no common implementation, there were small design differences on many elements among Google apps. With the new support lib (22.2), Google has released a design lib which implements some material elements. With this common base, I hope to see the design of the different first party apps harmonize a little bit more in the coming months.