Could the great filter just be a case of anthropic bias?
So the universe could be teeming with intelligent life, and theres no good reason there can't be any near us, but if there were we would not have existed. Hence we don't see any.
I've never heard that argument made before, but it makes a whole lot of sense to me.If anyone knows of a more formal treatment of it anywhere, I would love a pointer.
If it's worth saying, but not worth its own post, even in Discussion, it goes here.