What are the real pitfalls of driving balik kampung during Raya that nobody warns first-timers about?

KL to Kota Bharu is no joke, that's the East Coast run and the pitfalls are different from the North-South Highway. First, don't blindly trust Waze timing during Raya, a normal 7-hour drive can become 11-13 hours, and Waze will sometimes route you through kampung roads to save time where you'll get stuck behind lorries with nowhere to overtake. Second, the R&Rs on the way run out of food and the toilets become horror by afternoon, so eat and refuel whenever your tank hits half, don't wait for empty. Third, the stretch through Gua Musang and the winding hilly parts is exhausting and accident-prone at night, so if you can, drive that portion in daylight and take a proper 20-minute nap at an R&R if you feel drowsy, microsleep kills people every Raya. Prepare a car emergency kit, snacks, water, phone power bank, and download offline maps because signal drops in the interior.