I used to agree with OP when I was younger. Then I had my son.
He is hands down the thing I’m proudest and most thankful for in my life. And it has taken - if not hard work exactly - love, energy, patience, perseverance, self discipline, self sacrifice, cooperation, did I mention energy?
When you grow a new human, and look after this tiny helpless thing, whom you have to teach pretty much everything - how to eat, how to toilet, how to sleep, how to walk and talk, how to read and go to school and interact with others and on and on, and then you look at this almost-adult and feel so proud of them because they are absolutely their own unique person but you know you have supported them to flourish - it’s the best thing.
Im sure you know it when you come across a human who hasn’t been parented very well, for whatever reason. It absolutely is an accomplishment to do it well, and it also takes a bit of luck, and deserves far more societal support.