Sounds like an unpleasant task, done for users that don’t really want it, and don’t have much incentive or ability to contribute back to the community.

It sort of feels like we’re talking past each-other. I’ve been trying to point out that, due to the community nature of these open source projects, development tends to follow the interests of the people who tend to contribute open source code to the projects. You’ve listed a number of challenges or thresholds that you think are important. However, after reading your comments, I can’t articulate who those thresholds are important to or why they are worth following. I don’t need another litmus test, I need some reason to care about testing.

The idea of “Linux on the desktop” was a popular meme for a while, but I think it is a short-hand expression for a collection of things, some of which were achieved a decade ago, some of which weren’t, where there’s a strong correlation between “things that were accomplished” and “things that open source community contributors cared about,” and the remainder… were ignored because nobody wanted to do them.