Well, not exactly like non-Excel systems are bulletproof either.
Entire Japanese stock market went down last week, and it's not like there was a flood of people on HN bemoaning that. At least with Reinhart and Rogoff et al you have a responsible party.
As opposed to 'nameless machine failed, and nameless backup machine also failed, and now it's in JIRA so don't worry about it'.
https://www.nytimes.com/2020/09/30/business/tokyo-stock-mark...
The glitch stemmed from a problem in the hardware that powers the exchange, said the Japan Exchange Group, the exchange’s operator, during a news conference. The system failed to switch to a backup in response to the problem, a representative said.