I'm not too surprised. During Android's early years it was chasing a moving target as the standard mobile computing paradigm shifted from Blackberry/Treo type devices to iPhone clones. Then tablets got added to the mix and mobile SoCs outpaced Moore's Law for a while. The higher-level elements of the platform were inevitably going to be subjected to a degree of churn that Windows hasn't needed to deal with in about 20 years. (Of course, Windows has opted in to some churn with the revolving door of UI frameworks, but that's entirely self-inflicted.)