Tolerance/precision is all about choosing an appropriate one for the task, to achieve the desired results.

I’m not an automotive engineer, but nothing immediately jumps to mind on an automobile where this level of precision would be necessary, or indeed even desirable.

This just makes me think about the Vietnam war, where the far more precision engineered M16A1 was widely criticized for its unreliable performance in the harsh jungle environment, while the AK-47… built to whatever is the opposite of high precision and tight tolerance, was an absolute workhorse. It wouldn’t surprise me a bit if there were still caches of dozens or even hundreds of AK-47s buried in the jungle since the mid 70s, that could be dug up and immediately used today.