Android's development pace is slowing down, as is iOSes. Smartphones are not an innovative platform any more. It used to be that OSes got major new features like universal voice dictation, universal search, and turn-by-turn navigation, but in the last couple of years the two major platforms have been getting very iterative improvements; performance upgrades, visual polishes, proprietary assistant apps...
That's because the smartphone market is slowing undergoing commoditization. We're only a few years away from when Samsung could realistically swap out Android for another OS that looks on the surface to be the same and not many people will notice.