When you're older, will you be able to talk to your "good careers", invite them over for the holidays, share times good and bad with them?
1. It's a fallacy to assume that if another person chooses not to have kids, then their career must be the most important thing in their life.
And since you know nothing about the GP, it makes you sound like an ass.
2. You seem to imply that having children guarantees a functional family unit. Or that your adult children will want to spend time with you.
Or that you will even want to see them. There are no guarantees in life.
3. You're ignoring the differences in personality types. Some of us genuinely prefer solitude.
That's rather difficult to achieve when you're catering to a child's needs.
I didn't realize until after I had children how much I would have missed if I hadn't.
I'm very glad that you appreciate your children. Far too many grow up without that appreciation. But raising children is not for everyone... and those who recognize that before procreating should not feel pressured to choose otherwise. Raising children is not the only way to be happy in life - though most parents seem to feel otherwise.