[mannykannot]

The effects of a change may be immediate, but not necessarily immediately obvious. Subtle bugs are a problem in any programmable system.

[rodw]

Yes, and there are plenty of examples of spreadsheet-bugs having significant real-world impact. E.g.,

1. https://www.bloomberg.com/news/articles/2013-04-18/faq-reinh...

2. https://www.cio.com/article/2438188/enterprise-software/eigh...