but.. they can iterate real quick!
As long as the expert don't run of patience, he may be able to do that.
Consider finance sector -- the industry is powered by excel spreadsheets made by non-programmer having no clue how programming works.
Spreadsheet is a DSL for finance and a lot of other sectors. But the lack of formal logic capabilities shows when you seen the spreadsheet organization. Most only stand with ducktape all over the place.