I think it because it seems like a really easy thing to test with controlled experiments. Or at least, if it wasn’t before now then it would have been a big priority at the beginning. Instead we are getting news articles at the six-month mark that say ‘evidence is mounting’?
I guess you’re saying that this is yet another one of those ‘we just don’t know’ things? That’s really what flummoxes me in this whole ordeal. I expected we would have known more – more than we evidently do.