AI suggestions for the new Siri shortcuts are not available on iPhone 6 and iPhone 6 Plus. Craig Federighi, Apple's senior vice president, has confirmed the news to Redditor federicotrevisani 1, but there are minor inconveniences with older devices from Siri Shortcut.
The full text of Craig Federighi's e-mail is as follows.
I'm really happy to hear that you are enjoying iOS 12!
We are trying to have as many new software functions as possible on many devices at all times, but do not compromise the overall performance of the old device. Unfortunately, this was the case for iPhone 6 and 6 Plus Siri Shortcuts.
I hope you succeed, pursue passion and learn to write code. Software development is a wonderful creative career, and the kind of problem[-] Solving skills built through coding applies to many other areas as well!
First of all, I think it's really wonderful to take extra time to encourage Mr. Federighi to take time to answer Ferderico's questions and encourage them to learn how to write code.
As you noticed in iOS 12 introduction in WWDC 2018, Siri Shortcuts allows users to set their own Siri triggers associated with Siri's actions. This is better than straight training. This is because developers and customers do not train on their own, they do what they do.
Siri proposal for Siri shortcut
Federighi's answer seems to refer to Siri Shortcuts, but in reality it answered questions about Suggestions. The proposal is an AI based proposal for a new shortcut determined locally on the device. The A8 processor on iPhone 6 and 6 Plus obviously can not handle the task …