As i read this question Can なっている represent an ongoing change as well as a resultant (completed) change?, i don't quite understand why a verb like なる that normally take the sense of "to become", "to turn", "to reach", and for this reason to me sounds like a "progressive verb", in the -te form なっている, can assume the "resultative" type of verb. I know that the -ている form can take the meaning of a "resultative action", but i don't understand why it's used with なる. It's like "result of a progressive action" or something like that? And なる? When it can be used? Is なっている always a "result" or can be "progession" too?
Sorry for the bad explanation, I hope my question is clear.