As a scientist myself, you should always be very wary of things like this because scientists often think they have things totally figured out and then boom, oops, we knew nothing and the gene you altered or change you made has about 100 different effects that we hadn't thought of or known about. You make these sorts of mistakes in a human being and you've just given them problems for the entirety of their lifetime that they never asked for.

"First, do no harm" is harder to live up to than you think.