Imagine a code editor (probably embedded in some online where the developers would also work/code) that would show all the application code.
For developers, everything would be editable, so they could change logic, add logic, database calls, anything. On the other hand, for content editors, only strings (and arrays and numbers) would be editable. So the whole page would be freezed except for the parts between quotes. The developer could then hard-code these possibly-editable-values at code time (or leave them blank) and the non-developers edit them: categories, text content, values.