I don't know if this is the ideal takeaway. Otherwise, we should all prioritize making our products flimsier and more expensive.
I think it's just a straightforward failure of creativity — or, even more plainly, a failure to understand their customer. They had a great product, which led to a loyal following — why not expand into adjacent markets?
The cruel irony is that their product was related to something that's extremely disposable. Why not get into the business of coffee beans? Why not partner with interesting coffee growers? Subscription businesses have been huge for decades, now — why not offer consumers the ability to buy an espresso bean subscription to go with their Mokapot, thereby generating a reliable recurring revenue stream?
A glimpse at their Wikipedia page [1] suggests they never even tried to branch out from the small, comfortable niche of cookware.
[1]: https://en.wikipedia.org/wiki/Bialetti