I think of them (and certain others) as exceptions that prove the rule. If you take away the foundation of the sequences and the small number of awesome people (most of whom, mind you, came here because of Eliezer's sequences), you end up with a place that's indistinguishable from the programmer/atheist/transhumanist/etc. crowd, which is bad if LW is supposed to be making more than nominal progress over time.

Standard disclaimer edit because I have to: The exceptions don't prove the rule in the sense of providing evidence for the rule (indeed, they are technically evidence contrariwise), but they do allow you to notice it. This is what the phrase really means.