To be honest, if cars were engineered to a high standard as they can be, ver little maintenance would be required, which would mean lots of garages would close due to a lack of business. Probably why so many parts are still not corrosion-resistant, or in the case of wheels/tyres/suspension, deliberately chosen (unless you buy the base model of cheaper brands) so they have to be replaced every few years -IMO the manufacturers know the parts cannot stand up to ordinary use on modern road networks.
In some ways, we only have ourselves to blame (at least as far as wheels/tyres/suspension go), as we demand our cars with lots of 'bling' (low profile tyres be the obvious one, which very few of us actually get any benefit out of, as we don't take the cars to the limit of traction) but expect it to be offered at reasonable prices.
My Mazda 3 (mk1, Oct 2005 build) has just ticked over the 50k miles mark - all the engine bits are going just fine; I tend to go through batteries (one every 4 years - not so bad) due to bouts of low mileage (commuting by train instead of by car, depending upon the job) and now suspension parts (usual bad roads and speed humps, though 8-9 years ain't bad).
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