Interesting debate..
SEAS in my opinion is not perfect, but is definitely necessary. My sister undertook yr12 at a rural town high school and received an ENTER (or ATAR as it is now) score much lower than mine (I did year 12 in the city). However I'd say she has more academic aptitude than me, and performed better in her undergraduate studies. We've ended up studying the same graduate degree as well. Some of the stories of her yr12 were horrible! Her physics teacher did not teach them a thing and would instead spend classes talking to students about the local football games over the weekend! She self taught herself the course. Boys in particular, she said, would face social isolation if they were seen as "academic" or making an effort to study. Well anyways, I definitely think going to a disadvantaged school warrants consideration in the form of SEAS, which is what most of you have been saying. Yeah there are ways you can get through the system, but it's stories like my sisters which makes me believe the system is necessary.
It's always going to be hard to quantify "disadvantage", which of course makes the system not perfect, but there are a much larger number of kids out there who justifiably benefit from the system than those who slip through the cracks (I'm pretty sure this would be the case!). Reminds me of an article I was reading about Brazil awarding academic scholarships for kids who came from racial backgrounds who have historically suffered through disadvantage in the country (Brazilians of African and Native ancestry largely). Now both Africans and Natives in Brazil have mixed in a lot more with European Brazilians than say they have in places like the United States, making distinction of "race" a lot harder. So are large number of the population identify as "brown", essentially between "white" and "black". So yeah there was this case where two non-identical twin sisters applied for the university scholarship designed for giving Brazilians of African descent entry to the course, and one sister received the scholarship and the other didn't as this particular sister was phenotypically "browner" than the other sister (obviously one had received more "black" genes for skin colour and the other more "white" ones from mixed parents). Sorry for the tangent, but yeah in this case and the case of disadvantage it can sometimes be hard to draw a line of distinction... but you can't take it away from the kids who deserve it. You can try make it as strict as possible, but it's never going to be completely perfect.
Sorry again for the massive tangents... haha