whether Konkvistador's posts are slightly harmful for the community
It is ridiculous to argue that an eloquent and prolific poster who actually seems to have read the motherfucking sequences and doesn't get tired of trying help new people access them (a rare trait these days) is causing harm.
Even if that was so for every single thing he wrote, and note that when Lukeprog cites against his argument that productivity and openness to outside ideas on LW is lower than it should be, the bundle includes many of Konkvistador's posts as examples of openness and productivity! Imagine that!
At the very least his excellent taste in outside links that he regularly shares with the community make him definitely a signal not a noise man.
But please lets pile on him. I bet soon someone will bring up how he "violated the mindkilling" taboo or even acusse him of getting "minkilled".
Your rhetoric is for dismissing the question as ridiculous. I suggest actually considering the question, and expect that the answer accepted by Konkvistador is wrong on both levels (their contributions don't seem harmful on net, there are multiple meanings of "harmful" that should be addressed separately with different interventions, and stopping participation entirely doesn't seem to be the best response to the hypothetical of their contributions being harmful in some of these senses).
(For example, it's likely that for most posters, there is some aspect of their participation that is harmful, and the appropriate response is to figure out what that aspect is and fix it. So it's useful to consider these questions.)
If it's worth saying, but not worth its own post, even in Discussion, it goes here.