This is clearly a case of "just because we can doesn't mean we should". Sounds like a really bad idea to create life from sperm that doesn't even move. Some people are just not meant to have kids and should come to terms with it instead of passing their own problems on to the next generation. I think it's selfish. Also it's not like there aren't enough people already, adopt and give a good life to a healthy child that otherwise wouldn't have a future.
I actually find the nanobot something crazy. Regarding the "artificial insemination" question, I guess only those having such problems should speak. Just like the abortion question.
Oh yeah it's really crazy impressive, from a technology pov this is amazing.
I concede I'm neither a biologist nor a doctor, and if lazy sperm is not genetic, respectively if children born from this would lead a completely normal life: awesome. I just think knowingly passing on serious disabilities with a high chance to a new generation is something that should be avoided, specifically because you can't ask the people affected, which is the children born. In the end, it's just my ignorant weird feeling from what looks like Frankensteining together something that seems dead to create new life.
That's the same as saying only those with lots of money should be able to speak about how to manage wealth because poor people don't have experience doing so.
That could happen anyway unless you follow the eugenics path, but that's a completely different story.
These nanobots should be seen more like a prosthesis probably, or a walker