Hidden construction quality checks investors miss

Under-construction quality visible at site visits is a big red flag for future resale, especially for investors. I'm currently in a 2BHK in Sector 57, thinking of upgrading to a 3BHK or villa, maybe at Landmark Avana. But yaar, site pe jo quality dikhti hai, woh possession ke baad tikti hai kya? I've seen so many projects jahan cracks, seepage, aur fittings ke issues within a year aa jaate hain. This hits resale value badly and tenant attraction bhi mushkil ho jaati hai. Also, the promised amenities – like those fancy clubhouses – are they actually used or just add to the maintenance? Is the premium for these amenities justified agar future mein maintenance hi itni high ho? What do you guys check for during site visits beyond just aesthetics? Any specific red flags for construction quality that most buyers miss? Hope this helps someone else too.