There's no reason for "balancing acts" to occur in nature. For example, and to make this as much of an apples-to-apples comparison as possible, take two birds of similar size - the eagle and the dodo. The eagle is superior in every way - faster, stronger, smarter, better eyesight, and can fly. There is no "balancing act" on behalf of the dodo. This is why HBD is not a pure science - it is certainly science-based, but it's tainted by politically correct politics, as, sadly, so many scientific fields are these days.Sailer is an HBDer, which means he believes in a sort of "balancing act" concerning human racial differences. I don't expect him to change his position much he has had it for years.
HBDers are classic "alt-lighters" who want to cautiously express some controversial ideas without straying too far off the PC plantation and getting themselves canceled. The problem is that it won't work. Cancel culture is totalitarian; it has zero tolerance for dissent of any kind. James Watson, the co-discoverer of DNA and a far more brilliant scientist than Sailer or any other HBDer, was canceled for a statement that was milder than many of the things Sailer has said. HBDers think they can compromise or reason with wokeness. They can't. No one can. Woke people are ideological fanatics who will never compromise with anyone and cannot ever be reasoned with.
HBDers also think they can appeal to black people by selling them the "supa affletes" talking point. It won't work either. No one wants to be told that their race has a low average IQ, least of all a race with the "we wuz kangz" mentality. No amount of "at least you guys are supa affletes" sugar-coating will be enough to sufficiently sweeten the bitterness of the low IQ red pill.