If I understand your question correctly, I believe it is absolute.
I don't think one can; kind of lie, kind of steal, kind of kill, kind of sin.....
I believe the "evolving" or grey area are just subtile ways of desensitizing the truth. After all, it's much easier to engage in sin if everyone around you is doing the same. There's a validation (albeit wrong) that it okay or "truth", but that doesn't make it so.
When King Solomon writes that there is nothing new under the son, I can't see how something can "evolve" or be subjective.
As for God, his way is perfect, the word of the Lord is tried (or flawless) 2 Sam 22:31