What's the Relevance of Exodus 6?

Exodus 6, 3: I did not make myself fully known to them. The root there is this generic term for God that was widely recognized in the ancient Near East. But then we have God coming to Abraham to sort of demoses at the burning bush and revealing himself as I am who I am or I will be. There's a distinction there, but God can solvifically meet people in both.