Here’s Dr. Drang with a deeper dive into the issues about bringing Shortcuts to macOS:
Regardless of what comes to the Mac in 10.15, it seems inevitable that Marzipanification will eventually lead to a Mac Shortcuts app. Which raises the question of how Shortcuts will fit within the Mac automation environment.
Lots of good questions here and a lot of uncertainty. My guess is that what we get in 2019 will not be entirely satisfying and that we’ll have to wait a while before things settle down. But as Drang points out, if apps that you rely on for automation get turned into Marzipan versions that are inaccessible to scripting, things will be unpleasant.