Of course those Chirons won't broke, they'll be sitting at a controlled temperature garage most of their lifespan. Btw, if a car is a development mule I think it's quite expected to be unreliable, I guess it was cheaper to buy too. I'm not saying Koenigseggs are better than Bugattis, but to me these are more "in your face" cars than Bugattis, that became very fast luxury boats :P (Which is a feat itself too).
On an engineering side, cars are getting to power levels that were unthinkable of some decades ago. Also, this car got up to Mach 0.36, when this happens you must consider the air compression as a factor when designing the aerodynamics (Not that under 445km/h you don't have to consider it, but its effect aren't as "strong" as in higher speeds). Also, at that car was travelling 123.5 m/s on average, that's simply crazy for a street car... The top end of the automotive world is going crazy, and they don't seem to be stopping anytime soon, just let them fight.