I have super-bad genetics. Not so bad that I have an entirely terrible life, but bad enough that I wouldn't wish them on a child. I know they would hate me, since I am aware of how bad my genetics are.
People who have children think having children is the right choice, generally. They have to, to find meaning in all of the work of having and raising a child. That's understandable. But it is by no means the right choice for everyone.
I had a lousy childhood -- not just because of my genetics. There's no license, no mandatory training for having a child. You can just have one. Many parents are not qualified, by any measure. This keeps therapists well-employed.
Only have a child if you would like to be that child. Only have a child if you feel competent, and able, and certain that when they are an adult they will not resent you -- yes, it's natural to have some resentment for your parents, but this is not the sort of resentment I am talking about.
Do not UNDER ANY CIRCUMSTANCES have a child if you're just looking for 'legacy'. Write a book. Give to charity. But this is a terrible reason to have a child! Don't.