What I do find semi-confusing about this issue is the presumption that if you love your children and YOU thrive off that love, rather than it being purely selfish, that's automatically a bad thing.
If, in twenty-five years' time, my child told me excitedly she was moving to Canada, I'd be thrilled for her, because it was something she'd WANT :) And a few oceans wouldn't matter.
If someone told me tomorrow my child was in a terrible accident and had survived but would always remain dependent and helpless I'd be devastated (whilst also fully committed to caring for them of course.)
To be frank, it's a bit insulting to be told 'get a dog.' I like dogs, but I didn't carry my dog in my body, feed her from my body or know she's a part of me. And I am ridiculously soppy about my dog and cats
I do understand there is a point where love can become toxic - if it's used for control 'do that and Mummy won't love you' or to stifle 'Mummy needs you at home' but I'm not like that, as I hope my above examples show. But I do know if I hadn't had children I would be approaching a lonely middle age and old age.