Interestingly, with good enough scores and grades and a slight spin on this skill set (e.g., setting up large scale LAN tournaments, being world ranked in UT, etc.), you would distinguish yourself from the “sea of excellence” (you are correct that scores and grades are a narrow and incomplete definition by Ivy admissions standards).
In general, it is not a crapshoot.
There are some things that are very doable by any reasonable Ivy admit that will set them apart. Cal Newport has written quite a bit about this, and I agree with most (if not all) of what he says.
It may seem like a crap shoot, because some/many folks don’t realize what it is about a successful admit’s application that sets them apart. Fwiw, it’s not “better SAT and GPA” or “one more extracurricular”.
You have to show you are unique through essays and ECs, and that you will be an asset to the university community?
Or that you have chosen good parents?