I think ECs say the same kinds of things about non-disadvantaged kids that the other stuff I talked about earlier says about disadvantaged kids. They say a kid has free time, has other things they're passionate about, achieves a healthy work/life balance, and depending on the particular ECs, has a growth mindset.

You can tell the difference between a resume stacker and a genuine G/T polymath, but you have to sit down and talk with them. The second one can talk about their interests in a way that communicates passion. The first one might not be able to talk much about them at all.