Not everyone’s experience is the same
By jove, I think they've got it!
But you seem utterly determined to repeatedly hammer home your own
I'm stating my lived experience (and not my perception of my child's on their behalf), do you have a problem with that?
You also asserted that the majority of only children are unhappy in both childhood and adulthood
Yes, as an only child, and with the knowledge of other onlys in my experience, this is the case. Critically, not the parents of only children which is the majority of the trumpeting on this thread. The adult only children themselves. And the fact their parents can't understand that their only children don't voice being unhappy, for fear of affecting the relationship with the only immediate people in their lives, is really sad.
Unhappy is very broad too. Did I have an unhappy childhood? Depends on how you look at it. I did brilliant things. I excelled at school. I did what I wanted (within reason) with no one else to consider, and was given every opportunity. Saw so much of the world. Had loads of stuff. I had no one to share that with but my parents. No one to wake up with, run down on Christmas morning with, play games with. Playdates and hanging round with cousins when convenient to their families is nothing like full time siblings. There's rough with smooth, of course, but on balance the void of never having a sibling is something still present in my life, and many others.
with zero to back that up
Far from it. I have friends and family who "are" exactly what I am referring too. Loads of them. The women I work with, off out with their sisters. Popping round to their brother's for their nephew's birthday. The familial village it takes to raise a child, so to speak. It's the whole infrastructure you lose. And you can definitely try and fill those gaps with other things/people. But that's kind of the point I'm making.