This claim is first of all very narcissistic. Those who claim it need to think that their genes are so amazing that they are worth all the real and potential harms, the risk of a really bad life, the coercion of the fact of existence, the lack of prior consent to carrying the parents’ genes, all the fears, all the frustrations, all the anxieties, all the disappointments, all the losses, death at the end of life, and the fear of death during most of life. You have to be quite a narcissist to think that despite all this and more, fine genes like yours should be spread further.
This is also a very selfish claim because there is no one eager to carry your specific genes, or any genes in fact, before they are created. No one desires to be created before s/he is created, for the simple reason that there is no one who can desire anything before anyone is created. The desire for someone else to carry your genes is only yours, the creators, and therefore it is done for selfish, egocentric and narcissistic reasons.
There is also something objectifying about this claim because it treats a person, who will be completely unique and independent from his parents, as a receptacle for their genes.
And of course, even if your genes are indeed amazing, nothing guarantees that their meeting at the exact point in time when your child will be created will not cause problems or that it won’t happen that precisely your less good genes will come to the fore. Besides, genes do have a huge influence, but they are not the only factor that affects the creation of a person and his entire life. In fact, everything has an effect, from the uterine environment, experiences and stimuli of the fetus during pregnancy, certainly initial experiences and stimuli outside the womb, the mother’s diet during pregnancy, the person’s own nutrition after birth, the physical environment in which a person grows up, the society s/he is born into, the country s/he was born in, the cultural heritage to which s/he belongs, the human environment in which a person grows up including extended family, nuclear family, friends, acquaintances, educators, and of course the parents. So even if there were such a thing as fine genes, and even if it were possible to guarantee that only the finest genes of both parties would be passed on to the created person, there are numerous other factors that have a decisive influence on the shaping of the person, and all of them without exception cannot be completely controlled or their effect on the created person predicted. Even if there was such a thing as good genes, and even if your genes are indeed good, there is no guarantee that your children’s lives will be good.