It’s the most cost elective way to get economy and performance at the expense of durability. That’s not to say these motors car survive a reasonable length of time, but they are working harder then normal aspirated motors with greater displacement when every you step on it.
If the components are beefed up properly they can last just as long.
Just look at big turbo diesels that can run for a million miles.
It really boils down to designing to a price point.
Unfortunately those big turbo diesels are usually in fleet owned vehicles
And fleet vehicles are often better maintained than your neighbor’s car
A semi costs hundreds of thousands and is expected to last for several years and a million miles (if not longer)
Your neighbor’s car may cost 40,000 and isn’t expected to last 1 million miles (unless you’re that Volvo guy on the east coast)
There are lots of features, like air conditioning, that we use in spite of the fact that they put stress on and the engine and shorten its life.
Just because a vehicle is part of a fleet doesn’t mean, alone, that it is properly maintained or maintained better than most passenger vehicles.
@Whitey it all depends on the fleet and the neighbor
Having worked on an army base, Benz dealer, as a fleet mechanic and even doing side jobs at home, I see definite patterns.