I don't see any reason to consider genetic engineering as something, in fact, I think not using genetic engineering when needed could be what's actually immoral. If we can stop a disease why don't do it? It is moral to do it.

Human reproduction should not be interfered because we can’t simply “play with God”

yeah, that sounds like an argument a religious fanatic would say when seeing how science is solving important issues that improve the lives of everyone.

Modifying and improving ourselves is something good, and it will be the only way to survive in the future.