Or hardware improvements have become more incremental and less cataclysmic. From a software and developer side, it makes sense to drop 32 bit support early. I

Or hardware improvements have become more incremental and less cataclysmic. From a software and developer side, it makes sense to drop 32 bit support early. It's less radically different architectures to target. It means they can guarantee the performance of the os and apps. But as processors got good enough to handle most things, the need to drop the slow ones, and the slow ones holding back the software evolution is minimized.