Recently I decided to start using Siri Shortcuts, because it seemed pretty convenient. I download the shortcuts app, and the first thing I noticed is that the "Add to Siri" button is missing when editing a shortcut. Then I went to check settings, and shortcuts are entirely gone! Here's a screenshot:
This is strange because I remember it being there, in iOS 12.
I'm running iOS 13.1.1 on an iPhone 6s.