Most people I know have at least three devices. A laptop, a tablet, and a smartphone. Some have two of each, one for home, and one for work. If you’ve gone all Apple or all Android, the systems aren’t totally fragmented and disjointed, only partially so. Any deviation from either ecosystem, either at the device, app, or cloud service, and you start running into trouble.
I think it’s because the vendors don’t really know what we want.
They are learning the new style of computing at the same time we are. The cloud app vendors like Evernote and Dropbox are way ahead of the device and OS vendors, and it shows.