Ping!
I’m not so sure that we must use propositional truth as the absolute measure of how far illustrative truth can go. I sure don’t see this passage of scripture saying that, at any rate.
I mean... while propositional truth can not be violated, it is not a superior form to illustrative truth. Sometimes deeds speak louder than words; Jesus’ reticence to address the topic of whether He is God (even though it is now obvious to us that He is) is one such illustration. He didn’t have to preach to us that He was God, because His deeds preached that.
For the past two years I have been listening to the Word of Promise, New King James Version while I sleep at night. I can’t tell you how much sleeping in His Word means to having a firm grounding in the Word and how much more comfortable it makes you with what is happening today.