RERA Approved Projects: What hidden risks should I know?

Honestly, I thought RERA Approved Projects meant zero headaches, but ab thoda darr lag raha hai. I'm looking at a 2BHK in Chandigarh, near that RERA corridor. My parents keep saying RERA is a full guarantee, but I've heard stories about hidden risks even there. Kya true mein possession delays ho sakte hain? Ya quality issues, builder toh bol raha sab top-notch hai. Koi red flags hain jo first-time buyers like me ko pata honi chahiye? What's the real ground reality?