Nothing important actually ¯_(ツ)_/¯
https://en.wikipedia.org/wiki/Windows_Mobile yeah the iPhone wasn’t actually as revolutionary as people say it was.
Having better ux than windows mobile doesn’t mean that it makes history. It is just a bit better version of a cell phone. The main goal of this device was to ease content (mostly paid garbage or hidden ads) consumption.
If you exclude everything that is not needed to you specifically, you will find that there is just gps + maps, cell-phone, mp3 player and camera. And all of these features working worse than the same via dedicated devices.
Is it a revolution we deserve to combine good features and make them work worse?