> You would still be able to pass on your knowledge and
> attempt to create a better version of yourself
That depends on how much you believe children to be a blank slate which can be equally imprinted with knowledge. If you don't believe in a blank slate, and believe that children are genetically similar to their parents mentally as well as physically then this doesn't make much sense.Psychologically, I see a lot similarities between myself and my parents, and so I expect that when I at some point have my own children, my own experiences will guide me in how I understand and help them.
When I have children I will do so because I love my partner and would like if there were more people like her and because I feel like I'm a decent and strong person that should focus my life on more than just my own desires. I also know that both of our parents would like to be part of a larger family -- the people that you love, and that love you, generally want to see you multiply. Finally, I think that having a family could be a total laugh: it's great to experience good times together and it makes bad times lighter, too.