The fact that in the past updating one object would also update other overlaying objects wasn't really designed on purpose, it was a side effect of the fact that on the original MacOS, applications would draw directly to the screen. On OS X that was changed to eliminate screen flashing. I could probably get this to work in Panorama X, but there would be a huge performance penalty.
In Panorama 6 there were situation where this was the only way you could get certain types of objects to redraw. In Panorama X that is no longer the case, you can directly make any kind of object redraw without resorting to overlapping objects, even if you don't want to display the variable that is changing.