What are the drawbacks of engine auto start-stop?

[Margot]

Here are the drawbacks brought by engine auto start-stop: 1. Higher requirements for oil quality. 2. Increased engine cost. 3. Further rise in maintenance expenses. 4. Potential damage to related components such as starters and batteries. 5. Noticeable noise and vibration during startup, resulting in poor user experience. 6. Prone to carbon buildup. In cases of severe traffic congestion where the engine remains off for extended periods, the combustion chamber temperature drops. Unburned hydrocarbons and paraffin can form carbon deposits on cylinder walls, worsening with poor fuel quality.

[Ellis]

I find the auto start-stop feature most annoying in traffic jams. The moment the car comes to a stop, the engine shuts off with a clunk, then jerks back to life as soon as the car ahead moves—this cycle repeats every few seconds, jolting my neck sore. Prolonged use drains the battery rapidly; standard batteries last barely two years before replacement, while specialized AGM batteries cost over a thousand yuan. The AC is another headache—compressor stops with the engine, letting cabin temperatures soar in summer until the engine restarts to deliver cool air. It's such a frustrating experience that I routinely disable this function right after starting the car.