But that is a really good point, I am curious why both continue to exist except for not wanting to break existing Automator... automations? I am not sure what they are called.
Autommator does still have the major functionality (when it works) of being able to record your actions and just do those. Which shortcuts cannot do.
Apparently you can just convert automator to shortcuts: https://support.apple.com/guide/automator/use-your-workflows...
I would bet that it is the "record" functionality keeping it around (beyond just the "multi-year transition" apple said they were doing in 2021), but maybe there are some other power features that are unavailable in shortcuts yet.