Like just about everything, the tire companies have cut corners to maximize profits. The rubber used today is much worse in terms of long term use than tires of yore. I've seen it several times personally. It's a shame, but true.
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey
1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles
2017 Sierra SLT 1500 Z71 4X4 
2019 Canyon SLT Crew 4X4 
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