Just because now is better than in the past, doesn't mean now is worth bringing someone into the world.
That's just a logical argument, not whether or not you actually believe now is or isn't worth it. That's entirely subjective and not really worth arguing about IMO.
Not having children - and not curating a presumably well-mannered and intelligent next-generation - leaves our civilization worse off and large problems that much harder to solve.
Human intellect is rare, and partly hereditary. Please pass your genes along - at least offer a sperm or egg donation.
Some people take solace in the idea of childlessness.
I think that raising as many happy, healthy, intelligent and productive children as possible, with a suitable partner, is our very raison d'etre. Specifically for the high-IQ HN audience. Life and society becomes much simpler and more rewarding when you view things from this perspective.