His bias does not change the ultimate fact, which the referenced blog acknowledges:
"Canonical is primarily a consumer of the Linux kernel. It is one of the building blocks we need in order to fulfill our primary mission, which is to provide an operating system that end users want to use. It is, on the whole, a good piece of software which meets our needs well. We routinely backport patches from newer kernels, and fix bugs which are particularly relevant to us, but our kernel consists almost entirely of code we receive from upstream."
The Linux "ecosystem," whether that contains just a few pieces or every piece of software ever made for Linux, only works if everyone contributes. Eric Raymond spent quite a bit of time making this point in Cathedral and Bazaar. We know that in practice, only a small proportion of the user base actually contributes back to the community; therefore, it is even more critical that major distributors, of which Canonical is undeniably one, need to do their part to give as much back to the community as they take away from it.
Greg is saying, with a lot of justification, that Canonical is letting other distributors, especially RedHat and Novell, carry its water. The referenced blog post admits as much, but then goes on to try to cast it as a virtue, to opine that Ubuntu is about the whole operating system, not the kernel alone. Fair enough. But RedHat and Novell are in the business of putting together operating systems that "...end users want to use..." as well. What happens if, on Monday morning, they decide to follow the Canonical model, and become "...primarily a consumer of the Linux kernel...?"
Greg made it clear that, whatever your opinion on RedHat et al vs. Canonical, the majority of kernel hackers are doing this for a paycheck. If RedHat and Novell decide to pay their hackers to do something else, then the kernel process gets a lot slower and probably, a lot less functional.
It is time for Canonical to step up. I see claims all over the 'net that ubuntu is the most popular Linux desktop; it is time for Canonical to put some money behind that reputation. Step up, or shut up.