What is the effect of primitive data types on the nature of programming languages?

You might heard that "Using primitive type is faster and cost effective (memory+time) than using object oriented". This is the reason object oriented languages still allow primitive types.

Why it is faster and cost effective:
How class variable works:
When you declare String str = new String ("Z").
variable str will point to a memory location to an object. Now this object has it's own instance variable which creates an array of char to store the value passed in, i.e. : "ABC".
(And some other things whatever String class require to initialize and store the value).
For java see: code of String.java.

Now primitives:
When you declare a char c = 'Z'; . variable c will point directly to a memory location where char ' Z' is stored.
So obviously using char is faster and cheaper.

I hope this answers your question. Now, what's the pro and cons, dig it out 😉

PS: I suggest, not to get involved in pure or object oriented languages. They develop for usability not to fulfill criteria of something called Pure Object oriented or not.