Styleyd
yes this brilliant EV is certainly of the highest level for the reasons you state.
I think there is one unfortunate aspect. The theme is clearly to do with the second most famous physicist (5,4), but the quotation is usually attributed to the most famous one (6,8) who unfortunately, or fortunately, depending how you look at it, also features.
The pre-amble states "...associated with one of the physicists" , but it is often attributed to the 2 of them. I am not aware if has ever been attributed to the third (6,5)
I dont know if the 18D was aware of this. Really enjoyed all aspects of great puzzle.