I also think the new digital version was less hazardous to the person who had to wear the little rubber suit.

Seriously, nobody as far as I know has checked that out for early flights. I do know that the paint weighed about 1,000 lbs. (I think) more which for a tank that goes almost into orbit, means a loss of almost 1,000 lbs. of payload.

Some people also worry that a coat of paint strong enough to hold foam down might also create a "zipper" effect: a piece of foam at the top coming loose, and the paint coating hanging on to and peeling off more foam down below.

The key, of course, is not to put something fragile downwind of something that has parts coming loose. The icebergs falling off the Saturn 5 and bouncing off its plate aluminum structure were one of the coolest parts of a Saturn launch.

Had the Shuttle stack been an orbiter on top of a tank, this would never have been an issue. It's not like there isn't room in the VAB to have done that (see below). From my experience, though, there are serious aerodynamic issues with putting a winged vehicle on the nose of an expendable.