I think you're partially wrong here.
Producing a slow, dead road obviously makes Australia's quest to take 20 wickets far, far harder -- and in some cases they simply won't do it because they've bowled poorly -- but the supremacy of Australia's seam attack essentially means that if Australia can't do it, the opposition has next to no chance. If Hazlewood, Starc, Pattinson and Lyon can't take 20 wickets on that type of deck, the chances of Ishant, Bhuvi, Yadav, Ashwin and Jadeja doing it is infinitesimal. It doesn't help Australia win, per se, but it certainly makes it a hell of a lot harder for them to lose.
Contrast that with producing a bouncy greentop. You'd expect that Aussie attack to skittle India regularly, but it also means that Ishant, Bhuvi and Yadav suddenly have a lot to work with; it essentially narrows the gap between the two sides. It almost certainly guarantees a result, but it makes it more likely that one of the Indian quicks bowls the spell of his life to win them the game (all of a sudden having pitch assistance)