why is a life without kids still not promoted as a route to happiness?
Isn't it? Don't the statistics show that the longest lasting relationships are those without children? That the happiest couples are child free (by choice)?
That the biggest stress factor and highest rates of separation/ divorce are in the first five years of a child being born?
I think your statement may well have been some decades ago, but I think since the 90s, being child free is as fine as being encumbered with them.
Of course some traditional people think you can't be 'whole' without a kid, but they're likely to be the same people who think women shouldn't work, and men should be free of all domestic chores, so I wouldn't give them head space.
I have plenty of child free female friends, hand on heart none regret their choices, and now they are heading towards retirement and amazing retirement plans, I slightly regret my choice of having kids quite so late, and retirement plans years off, dh and I would be so much wealthier, and looking at reducing hours if it wasn't for our little 'darlings' grumpy teens!
I certainly won't be putting any pressure on my kids to have kids....the opposite in fact!