The only metric that's important is the CTO's bonus

When everyone is suffering because AWS is having its bi-yearly 8 hour outage, the CTO isn't blamed, bonus all round, and maybe the AWS sales team takes him for an apology lunch

When the CTO is up for 1500 days straight then has a 2 hour downtime when nobody else does, the CTO is blamed, no bonus, and more likely to get fired