are they not ? If your game crashes constantly no console vendor will let you have it on their platform and PC gamers are also turned off immensly by games crashing. Imo any game developer has to avoid it at all costs.

99.999% means roughly 30 seconds of downtime a month. If you play 4 hours a day every day, that means two periods of 30 second downtime a year. I can't imagine any game even trying to reach that sort of stability. It would be a complete waste of time and resources

you just downvoted me because games dont have 99.999% (in the sense of the word) uptime, which is not what i meant anyway... The thing is, crashes are not acceptable and so measures need to be taken, which is what Carmacks original quote is referring to.