I have seen critical enterprise applications run in VBA in excel.
I wrote one of them. It replaced periodically writing down application outputs on paper and sounding the alarm if something went pear-shaped. It wasn't my job to develop software but I didn't want hand cramps to be my job, either. I had vague ideas about how to do what I wanted to do with Excel so I poked at it and googled until it worked. More than a decade later, I'm no longer there but that freakin spreadsheet is still running 24/7, being proudly showed off during tours of the facility.