If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.
No, I don't think that is the key difference. I think the reason that SIAI (at the time) payed attention to Karnofsky is that he was willing to signal his in-group membership and speak the local jargon, thereby preventing his criticisms from being immediately dismissed (I think MIRI has gotten better about this lately, but they've been pitching themselves so high-status that it's screwing with my intuition about their likely behavior :/ )