What nobody tells you about post-possession snags

Since last year, I've been searching for a 3BHK in Delhi for my kids. Sathi Apartments ka brochure toh sahi lagta hai, but I'm really concerned about the actual construction quality post-possession. Jo finishing issues ya small snags site par dikhte hain, woh theek ho jaate hain kya? Ya fir baad mein cracks aur seepage jaise bade problems aate hain? We need a safe ghar, not constant repairs. Any long-term owners of Sathi Apartments, please share your experience with post-possession snags.