Unlike new mothers, there is no sound biological reason for fathers to require extended paternity leave. Throughout human history, fathers have had an imperative to provide for their families and generally couldn’t afford the opportunity cost of taking an extended paternity leave. If there was a biological reason for this, it would have become culturally enshrined a long time ago there would be no debate on its merits. This a “nice to have” not a “need to have”. Our needs fundamentally arise from biology and thus have evolutionary origins. Saying otherwise because it isn’t convenient is “horseshit”.