What builders hide until possession day

Okay I'll be honest — I work in real estate but buying for myself for Vatika The Seven Lamps has been an eye-opener. Builder ne bola tha possession 2023 end tak, ab 2024 mid ho gaya. Delay toh expected tha, but communication bilkul zero. Fir possession ke time hidden charges ka pura list. Maintenance deposit, utility charges, aur kya-kya. Builders yeh sab pehle kyun nahi batate? Aur defect liability period mein repairs ka kya scene hai? Koi experience share karo please.