Consider this recent article from 9to5Mac: Concept: How Apple could turn HomePod mini into a delightful and adorable smart display - 9to5Mac.
Please, stop thinking that a screen on the HomePod mini makes sense because it just doesn’t. Why? Well, by looking at where we put these devices in our house, most of the time, you wouldn’t be able to see the screen from a distance. What Apple really wishes is that you buy an iPad mini with a Smart Folio cover for that purpose.