That is not true, there are many car parts I can replace without voiding the warranty. Tires, oil, windscreen wipers, seats, car stereo, the exhaust, the batter

That is not true, there are many car parts I can replace without voiding the warranty. Tires, oil, windscreen wipers, seats, car stereo, the exhaust, the battery, the list goes on. You are perhaps focusing on engine parts only. Apple is not so lenient.