“You can read what even MIT says about unilateral.”
It would depend on your definition of unilateral, MIT accepts a lot of kids who are well rounded academically sure, but unilateral when it comes to ECs, activities, and other things outside the classroom. They focus mostly on stem-related work - science fairs, Olympiads, research.
“For a tippy top, not a collection of specialists”
Well Stanford has a lot more specialists than generalists on campus. Whether it’s the top-10 track and field sprinter or swimmer or top math, cs, literature students, they’re specialists, and that’s pretty much what they do when they’re at Stanford.
Anyway as CPT mentions, the OP has to get to the holistic review at these places, the urm/first-gen could do it anyway.