I don't know why you were voted down, because yours is the most relevant point about this article.

It doesn't matter that 90,95,99,whatever% of sourceforge projects are dead audio mixers that not even the original developers are using. Those projects can be ignored. They don't take up physical space, and we're not running out of internet. Just ignore them.

What matters is the quality of the actively developed free software. Any study on the quality of FOSS should start and end with actively used and developed software and ignore those that have been selected out of the software pool, because that is the process of FOSS development.