Sorry for being unclear: I’m intending to use the iPad for drawing with Procreate. At least as far as all the commercial illustrators that I personally know (which is quite a few) this is now their standard production setup.
For video I’m gonna try the iOS application LumaFusion - this is new to me, so I have no idea how it compares to apps like Final Cut Pro or Premiere, that I’ve used in the past - but I’ve seen some encouraging YouTube videos showing editors using it, at what seems to me blinding speed.
The Mac mini would only be used for Xcode and other stuff that isn’t available on iOS (or iPadOS).