Alyssa Vance expands on this point in her FB post:

I think the current message of effective altruism heavily discourages creativity, that is, having new ideas rather than evaluating existing ones. This theory is hard to quantify, but e.g., a few months back, I did an informal survey of the EA Facebook group. By my count, there were 163 total posts over three months. Of those, 99 posts (61%) were meta-discussion about marketing EA, organizing EA events, doing outreach to donors about EA, the media image of EA, etc. Only 15 posts (9%) were about object-level causes, and of those, 12 were very unoriginal - they discussed causes that already received massive ongoing media coverage, like water desalination, promoting vegetarianism, blood donation, disaster relief, and the like. And of the remaining three, two got zero comments.