I've had dozens of computers, and none of the logic boards ever failed over several months/years of usage. The 2010 MBP was my first ever logic board failure, and it happened in a week, not a good sign. And it wasn't an isolated incident, check the forum threads, tons of reports of failed boards.
Did every MBP 2010 produced fail ? NO
Did Ton's or millions (if you will) fail ? NO
Are Apple service center swamped with lines around
the Genius bars and stacks of broken 2010 MBPs ? NO
If it happens to you of course it isn't isolated, but it doesn't mean the sky is falling either.
SO for the sake of argument in Apples heritage lets agree some computers may never fail and some may fail more often then others.
And I agree with you that some products seem to kick the bucket sooner than others.
A manufactures warranty is a STRONG indicator as to the design life cycle of their product.
They are saying you give us your money and we will deliver a product that is designed to function for ONE to THREE (with Apple care) years.
THAT IS IT, no warranty extensions for love or money.
Screens don't magically inherit extra brightness or life, batteries will not cycle for ever, fans will not spin continuously into the sunset.
Repetitive thermal shock will make an end of semiconductor and their interconnections.
Consume products are NOT engineered like a satellite launched into space that cannot fail and require redundant systems.
Anything past your 1-3 year purchase that feels more like a lease is gravy.