RERA registration is just paperwork, real due diligence is elsewhere.

Was supposed to finalize my Next India Rashtra investment by SRV Landbase but legal due diligence stuck me. RERA registration is basic, but how deeply do you check a builder's past legal issues or RERA complaints? Gurgaon mein projects delay hote hain even with RERA. Is a builder's legal track record check truly effective, or just a formality before BBA?