We are all different with different needs and likes. If the mini doesn’t fit into your day anymore or you have no use, pass it on to someone who can make use of it (a very nice gift) or sell it.
There is no right or wrong.
This.
As an example...
For some (not me), the iPad Mini is the
only form factor that matters because something as simple as (real world example) it fits in a boot. e.g., we have a bunch of miners who work underground and the mini (carried for a few business applications they use) will slip alongside their ankle in a gumboot - or in a large jacket pocket, etc.. which means they can slip it in there to be safe while they work on something. Rather than place on a rocky, wet, dirty environment or somewhere less safe.
It simply doesn't matter how much bigger/better a full size ipad or pro is - that single factor means they are totally irrelevant for these guys because they are so much less convenient to keep close to hand while actually doing their job.
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But for most of what I do these days on a “computer” - my iPad works. Reading news, email, communication with family, watching YouTube, reading books, writing in my journal (Day One), brainstorming on Notability with Apple Pencil, and saving bills to iCloud.
Same.
My desktop is relegated to multi-window workflows, high end gaming and... little else.
Most frequently done tasks i can do on the ipad. Much more conveniently, away from my desk.
This is (part of) the future of computing. It's not a desktop replacement for 100% of all workloads, all the time. But it can certainly get the majority done right "then and there" without needing to drop what you're doing (in the real world) and return to a desk.
As AR gets better, AR will take over a lot of this sort of "computing" work as well. Why do data entry on a portable tablet when you can look at stuff and have the camera/GPS/other sensors do it for you (e.g., stock-take, looking up reference material on something you're working on, etc.).