Keyboard Maestro 8 adds a bunch of ways you can make your macros more interactive.
There is a new Prompt for File action to prompt for an new or existing file or folder (and you can still use the Finder Selection as a another way of selecting files).
You can use the Show Palette of Macros action to ask for a selection from a set of macros, or you can use a Spotlike-like selection using the Trigger Macro by Name action, which now has an option to select from a subset of macros.
If you have a Touch Bar, you can ask for a selection from there using the Get Touch Bar Selection action.
You can also use the Prompt With List action to select from a set of values using a Spotlike-like selection.
And there are some enhancements to the Custom HTML Prompt action, such as allowing it to not-float, to be resized, and to stay open indefinitely, all of which could be put to good use in creating a custom user interface.
So these new additions should open up some new areas to automate with additional user-interaction.