From the comments:

Effects of genes are complex. Knowing a gene is involved in intelligence doesn't tell us what it does and what other effects it has. I wouldn't accept any edits to my genome without the consequences being very well understood (or in a last-ditch effort to save my life). ... Source: research career as a computational cognitive neuroscientist.

OP:

You don't need to understand the causal mechanism of genes. Evolution has no clue what effects a gene is going to have, yet it can still optimize reproductive fitness. The entire field of machine learning works on black box optimization.

Very casually putting evolution in the same category as modifying my own genes one at a time until I become Jimmy Neutron.

Such a weird, myopic way of looking at everything. OP didn't appear to consider the downsides brought up by the commenter at all, and just plowed straight on through to "evolution did without understanding so we can too."