*I don't have financial worries, anxiety, stress, problems, a sick child, any restraints in my life - I'm unconditionally happy. I can go on amazing holidays. Travel. Instead of paying for kids, pay for flight upgrades or luxury resorts. Sleep well every night. Quit my job tomorrow if I wanted as I feel more secure taking risks. Leave my partner if he gave me a reason to, instead of thinking about the kids.
While parenthood must bring a lot of joy to people who wanted to be parents, it's no secret that there are downsides and day to day many parents probably aren't happy. Dealing with a sick child, busy life, stress at work multiplied by something at home. Wishing you had more time for yourself. Worrying about your teenage child. Why are we pretending like that's not the case?*
@Miajk I don't think anyone is pretending that's not the case, I think what you have to ask yourself is why, given all of what you've said, do many parents still say that having children is the best thing they've ever done. I think research has shown that child free people might class themselves as happier, but that parents report more meaning and purpose in their lives. There is something magical about bringing up your children that nothing else comes close to. The sense of you actually mattering on this earth is amazing.
I know everyone is different but I wouldn't swap my children and the life I've had with them for the things you've listed above.
They are adults now with children of their own and they are my very best friends in the world. I'm so proud of my DS and DD. They know me better than anyone and we just get each other. The times we spend together are so precious. My grandchildren are literally the light of my life.