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Guess the question avoids the Automobile mantra of "Built in Obsolescence"... Cars are not designed with the thoughts of "Longevity". Cost, Consistency, Profitability, etc, rule. But certainly not the worry that you might have to maintain your vehicle in order for it to last. They WANT you coming back for another vehicle as soon as possible. Not in 20 years!
That is all...
Besides, if it's is a "known" failure point, pay attention to it, do some preemptive maintenance and avoid the downtime experience with an unexpected failure.
Engines in the 70's lasted if you maintained them properly. But some maintenance items by today's standards could be considered a big job. Advances in technology, like metallurgy have allowed things to last much longer, handle more stress and such. The economy of the output of the engines, ie, HP per CU today is pretty amazing as well. This allows engines to do less work, leading to better survivability. All my opinion in working with cars and engines over the last 4 decades of my life, lol.
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