I hear you on this, but this is the deal: The difference in requiring chains on with 4wd and snow rated tires and just closing the freeway.... none. Before enforcement of the former occurs, they just close.
My house is exactly 3/4 of a mile from where they check for chains or turn trucks around. I see it all the time every year.
Here's another, while the law states exactly as you put it, having lived at the snow line now for 25 years, I have yet to be checked to see if I have had chains. I have driven across the passes so many times since I could drive and have still never been checked for chains. So over 40 years. (I have family in Truckee... named by one of my ancestors no less).
I keep my chains with me just in case, but bottom line is, if your tires pass the casual visual and you clearly have 4wd, you are continuing or you are stopped as the road is closed, chains notwithstanding.
Where ice (not just snow) is concerned, yeah, you need chains.