As a father of 3 daughters now approaching 50 with my oldest now 24 … I will say that I believe some of this is true. Perhaps it is just the life altering effect of raising children or maybe is biological as well. You can definitely pickup on whether another male is a father or not.

Mom brain is also a thing. Large scale, consistent, structural changes in the postpartum brain that is uncorrelated with PPD. https://doi.org/10.1093/cercor/bhab463

    By the time Gettler looked into this field, it was already an established fact that fathers had lower testosterone that [sic] men without kids.

I suspect this typographical error will be promptly corrected. But it does offer some sense as to how thoroughly this article was proofread prior to publication.

I swear my hearing got more sensitive with kids. Also, some commercials hit differently.

> that men have all the necessary biological wiring to be "every bit as protective and nurturing as the most committed mother

This seems like an overstatement - man can't give birth to or feed babies.