The user interface did have a complete re-think. Windows phone popularized tiles and live tiles which was not just innovative, but an order of magnitude easier

The user interface did have a complete re-think. Windows phone popularized tiles and live tiles which was not just innovative, but an order of magnitude easier and more ergonomical compared to icons, esp for older people. The comforting common-cross-app back button, the metro UI, the smooth performance, ability to store all apps on SD card, best phone keyboard of that era, integration with windows PC - they had the bare-bones down fine. But simply gave up after a few years, instead of incrementally improving. I thought it was a bad mistake to bow, kneel and surrender the smart-phone market space. Today, I am fully convinced it was a critical, life-threatening mistake as more folks move to the Apple ecosystem - buying both iPhones, Macbooks and Apple Watches because of a fully-integrated ecosystem. The funny thing it was Microsoft who popularized Continuity, but after they gave up due to lack of willpower, it was Apple who took over, executed better and won. Really frustrating to see the state of Windows OS and device market today.