Sure. But realizing that objects are just structs with function pointers takes you from a binary "this code uses objects" vs. "this code doesn't use objects" t

Sure. But realizing that objects are just structs with function pointers takes you from a binary "this code uses objects" vs. "this code doesn't use objects" to a more flexible "this code is designed in a more objecty way than that code". A lot of people think about objects as a language feature, when they're really a design paradigm; and like all good design paradigms, you can use more or less of them depending on how well the paradigm fits a particular piece of code.