"Flawless for the user mean fatally flawed for the manufacturer. The manufacturer wants something like a mouse to work well enough but last just long enough that you're willing to replace it when it breaks. "
That may be generally the case., but as I sit here mousing with a microsoft wheel mouse optical that I have used daily for 8-12 years, I would say that either microsoft fucked up large, or they let the engineers run this one. The thing is just built to last. They very rarely fail in my professional life over thousands that have been deployed. They pretty much have to be repeatedly swung into something to fail.
Credit where credit is due. And there are always products like this, just gotta look. Can you imagine when we can make these designs live forever with open source 3d printing? no one ever need design a mouse again!