From 2BHK to 3BHK: RERA ki asliyat kya hai?

Okay I'll say what no one says – RERA is great on paper, but practically, kitna help karta hai? I'm looking at a 3BHK in Kokapet, maybe Salarpuria Sattva. Everyone glorifies RERA, but builder ka legal track record kaise check karein beyond just that number? Kya RERA complaints actually effective hain jab builder delays karta hai? I'm not so sure. Disagree? Tell me why.