I'd change it a bit: The quality of any collaborative creative endeavor tends to approach the level of taste of [the talent or] whoever is in charge [whichever is lower].
This was also discussed in an essay in The Mythical Man-Month. Funny how a lot of things have been discussed before...
"Conceptual Integrity" is the term used there.
Maybe because it's true. When two minds think the same problem through...
From the 'Hacker News' guidelines:
"Please submit the original source. If a blog post reports on something they found on another site, submit the latter. "
In this case is the original source the Youtube video? 99% of the time it is better to submit an embedded Youtube video than the original, especially with reasonable commentary. Have you read Youtube comments lately?