One of the features I really liked in Windows 8/8.1 was the ability to sync the layout of my Start Screen between devices that used the same Microsoft Account. Right alongside of that feature there was also the ability to install an app on one device and then have that app show up on other machines that used the same Microsoft Account.
The app sync was very handy because for most of us if we are going to use an app on one device we are most likely going to use it on our other ones. Once it was installed on one machine all you had to do was go to the All Apps screen on your other devices and tap on the tile to begin the download/install.
New apps also appeared on all of your Start Screens if you placed a tile for that application there and you could also easily install it with a single tap on the tile as you used other devices.
Unfortunately, I have confirmed with a Microsoft spokesperson that both of these features are being deprecated in Windows 10.
With Windows 8.1 and initial Windows 10 feedback we found that customers typically want to personalize the Start layout to match the device they are using. With the new Windows Store, scalability of universal Windows apps is fully supported across all of your devices. This means that customers can get their apps and settings available across all of their devices and still create custom Start tile layouts that make the most sense for each device and screen size.