At these point phones are just full blown pocket computers. In fact, Ubuntu for Android lets you dock the phone and use it like a desktop https://www.theverge.com/2012/2/21/2812424/ubuntu-for-android-hands-on

I think it would be kind neat if you could just have one device you carry around with you, that way you wouldn't even need an cloud services to sync stuff like calendars or email across devices.