The only thing the Minis need to do is GTFO and/or DIACF**. As speakers they're atrocious and inarguably a massive downgrade compared to their OG HomePod brethren. I have 4 Minis (one stereo pair each in different rooms) and they are simply unimpressive as audio devices. It's a freakin' speaker, it's primary job is to produce sound. Sure it's also to interact with Siri, but how sane is that?
"Hey Siri, what day is it?"
"... One sec... working on that... I'm having trouble connecting to the Internet. For more info, check the home app."
The actual current situation in my environment right now, both for Minis and HomePod OG devices -- and only them. Ironic eh? It's like she knows I'm saying anything but all-loving, all-praising things about her (Siri).
**The Minis have their place, don't get me wrong. For instance they can act as a Border Router for Thread devices (for modern HomeKit / Matter devices), and I incorporated them and a pair of 2nd gen Apple TV 4K devices for this alone. But for sound....? Gross. Really hope that Apple brings back the HomePod OG in some impressive updated configuration.