I don't know. I have a pro max, it's my primary media consumption device. A full-sized iPad or iPad pro seems like it would be a better companion.
That said, there are niche cashes where a mini might be super handy. I've got a Mini 6 on order because I want to use it in my car as a display for my RV's backup camera, use it as an alternative to my iPhone to be a display for my DJI Drone, and use it as an e-reader. I'll happily admit that's pretty overkill for the price of the device, and I admit I'm curious if I'll ever use it OUTSIDE of those specific niche cases.