Best I can tell, it's not so much what you believe that matters here as what you say and do

I agree with the rest of your comment, but this seems very wrong to me. I'd say rather that the unity we (should) look for on LW is usually more meta-level than object-level, more about pursuing correct processes of changing belief than about holding the right conclusions. Object-level understanding, if not agreement, will usually emerge on its own if the meta-level is in good shape.