[eru]

Add another 'one': one point in time.

What I mean is that Excel is essentially a write-only language. It's very quick to prototype something for a semi-technical person, but auditing / code-reviewing an Excel sheet later is essentially impossible. The ubiquitous manual loop unrolling doesn't help readability either.

[jstandard]

From my experience, this is more dependent on the team/process than Excel. I've worked in investments for several years and auditing Excel sheets was a core, well-run process at several companies I worked for. It was quite easy for smart, non-technical folks to follow formulas and equations to track down why their checks weren't passing.

It also scaled fine to thousands of employees.