Stephen Hawking.
Ok. I'll explain, because you're all thick...
Hyperevolution has supplanted evolution with the onset of language, oral tradition and the development of writing.
Memes not Genes.
Case in point: if the OP's hypothetical Huxley-esque world held sway an amniocentesis of Mrs Hawking may have lead to an abortion, or a social segregation of Stephen due to his ALS. Yet, it is because we live in a just society that doesn't immediately give up on the disabled that we can be surprised to find that some are merely physically disabled and can generate memes (replicatable ideas) that lead to progress.
How many great thinkers have been deaf, blind, schizophrenic, manic-depressive.
I invite the rest of this forum to suggest some names...