> Dads basically spend the first 2 years loving their child but primarily supporting Mom, because the kid is so dependent on mom (literally physically for a period of time too)

FWIW although this might be common, it's not always true.

My wife went back to work about four months after our eldest was born (her choice, no pressure from employer), I was working from home - and flexibly - and so I got a lot of quality time with him until he was 18 months and started at daycare. That including us attending the local "mother and baby" group (yes, it was called that) together.

After we had two further kids, both of which I also took to "mother and baby" group, they finally renamed the group ;)