I agree that this is a faulty design and shouldn't happen. Manufacturer warranties exist solely to cover defects. If it is expected that engines should run without major repair until 150,000 miles for example, than that would have to be fought for, perhaps regulated. Just as EV batteries are mandated to be warrantied to 100,000 miles.
So the typical 60K powertrain warranty is there to protect buyers from manufacturing defects. Do I think it should be higher? Yes, but it isn't. If the engine explodes at 60,001 miles, the manufacturer has no obligation to help. It's strictly good will at that point. If it is a known defect, the company can do good by the customer and help to preserve loyalty and reputation.
Hyundai and Kia made a big deal out of their 100K powertrain warranties. They still managed to weasel out of covering many issues. Industry standard is 60K though and expecting that to be ignored just doesn't make sense. I think because there's an expectation that engines are supposed to last the general life of a car that it makes us think that we should have protection for that time. There is no lifetime warranty though. 60k means 60k.