I use an iPhone as well as the iPad and the keyboard shortcuts on the iPad are automatically updated to the iPhone. As I tend to start my shortcuts with a "comma", a great suggestion earlier in this debate by twerppoet, there is a minor problem on the iPhone.
When putting a shortcut for an email address on the iPhone the popup keyboard doesn't have the comma shown (as far as I can see) so I have had to alter the shortcut for email addresses to have a "full stop" in front, not a problem on my iPad as I use a bluetooth keyboard.
This may or may not be helpful info for someone!
Sent from my iPad using iPF