The mini is a weird beast for me. I LOVE the size and form factor and just general compactness of the iPad mini. My younger son still uses my old mini 3 and every time I do something on it I remember how much I loved it for reading in bed, watching video, games, etc. The problem is when I try to push it past any of those tasks. It's just too small for me to want to use it as anything but an e-reader or video screen, and to me that's not worth owning a second iPad. If the iPad mini is far too small for me to do most of the things I do on my iPad Pro, then I may as well just use my 11 Pro Max for that stuff.
So I have always loved the iPad mini ever since I bought my wife the first gen model. But for my daily use and workflow, the larger iPhones and the introduction of the iPad Pro eliminated the need to own one myself. The Pros have gotten so thin and light, I have no qualms about using them as e readers, even the 12.9" model.