It is important to have clear understanding of processes going on in coolant system. Nothing fails all of a sudden, there are certain things leading to faults. Not talking of issues caused by low quality parts. Soft failing thermostat, damaged fan clutch or radiator cells covered with dirt can significantly load cooling system by raising overall temperature = pressure in cooling system, and you can drive car with such issue for long time, not knowing that as temperature is within temperature gauge threshold, Then bursted ET or cracked radiator - and then complaints of stupid design, etc. Simple replacing damaged part without finding a cause will keep you running till next weakest element dies.