What is the objective measure of usability to which you are referring? I'm not aware of any such metric.
> As for your high standards vs tendonitis distinction, I'd say these things are not mutually exclusive, and the comparison is not related to what we're talking about.
The connection is that I have different needs in HIDs, just like some people have different needs in Obsidian. There are great ergonomic keyboards available for $50. I just can't use them.
Generally I buy the cheapest peripherals available. My standards are not all that high. Several of them have bugs I've learned to work around.