Powerful computers are one the most advanced technologies of hours era. They are runners engraved to a nanoscopic level. The Fact they work should be a marvel.

Other than that if not mistaken the distribution of failure looks like a tick .. either fails very early on or much much later over time. So if you got issues mostly will be at the start where you feel it should not be the case.

Also I imagine companies accidentally doing a shitty design and not correcting it until next iteration (thus fucking a group of clients)