it always interesting when multi billion dollar company's costing system is a 63 tab excel 97 spreadsheet at it's core...

My take is that Excel is great for people to throw together quick and efficient tools for their own use. The problem is when these get distributed and then everyone uses something that has no version control or QA/QC.

I see this a lot because an engineer gets annoyed with IT or existing software restrictions and learns enough VBA to be dangerous. (Spoiler, it me.)