I'm not sure where you got "we don't need" from, unless you consider any language feature to be unnecessary if there's a way to implement the concept without it. Which is not a very useful way of looking at language features! You can implement anything in assembly, that doesn't mean higher-level languages aren't needed.
I'm saying that OOP as a concept is simple enough that you can do the basics of it in pretty idiomatic and straightforward C, and all the other stuff that we associate with "OOP" is not really universal. And thus it's no surprise that discussions around OOP as a general concept tend to be vague and not very useful.
I'm saying that OOP as a concept is simple enough that you can do the basics of it in pretty idiomatic and straightforward C, and all the other stuff that we associate with "OOP" is not really universal. And thus it's no surprise that discussions around OOP as a general concept tend to be vague and not very useful.