1) No one, not even me, said system is irrelevant.
So, then, are we all in agreement that system matters? Because I am more then willing to accept that "system doesn't matter as much to some people", even if those who claim that system doesn't matter as much to them might not be accurate in that claim.
6) Only in Raven-land does the statement: "System doesn't matter that much to me" equate to "You must find free game and play only that or be guilty of logic-crime".
6.1) This is probably because the national sport of Raven-land is using logic where it doesn't really apply.
Logic always applies, when determining whether or not a given statement makes sense.
For example, look at your (7) and (8):
7) In Mallus-land it means "When it comes to campaign style/flavor/feel, the system isn't as important as the people using it".
8) It also means "I'm not looking for an ideal system. I like and play several games. Some it's not contradictory for me to purchase different game systems over the course of a few years".
If you like and play several games, and you play those games with the same people, then while it may be true that the system isn't as important as the people using it, it must also be true that the system is important. Othewise, why play additional games?
Because you like shopping
for new systems? Strongly implies system is important.
Because you like playing different systems? Strongly implies system is important.
So, as long as we agree that system matters, not only are we in agreement on this topic, but, AFAICT, we are in agreement with the original blog post.
RC