I did a bit of research a couple of months ago when I wanted to set up Sidecar for illustration (but couldn't because my Macbook is slightly too old); it seems that, whether with Sidecar or other paid Apps, the iPad as a drawing tablet may not be ideal if you need fine control.

Just thought I'd note that in case this setup is very important to you before you buy your Mac Mini. I don't do any sort of graphics design and video editing, but people seem to be generally pretty happy with it for those purposes.

Also, many of the free drawing Apps in the App Store are actually very full-featured and feel fantastic to draw with (please support them if you like them), which is what I settled on in the end. The only thing that I miss about my Wacom Intuos is the textured surface.

Edit: removed repeated "a couple of months ago" and "in case", moved things around a little.