I think everyone just fears being that one in a hundred recipients of a bum playfield. Is it one in 50, 100, or one in 500 or 1000? I don't know, but it is not ZERO to be sure. Are they major defects that leave the factory or minor ones? All over the board I am sure. Problems with paint, Clearcoat, warping and mechanics seem pretty obvious to be caught....
IMHO, at these prices, anything that leaves the factory should be thoroughly QC'd visually and functionally, and sent to re-work/repair if any problems are found BEFORE the machines are shipped. This deep detailed QC may not be happening or may not be as critical as we all are. Very frustrating, but as others have said for the past few years, how the manufacturer resolves quality problems is one of the biggest measures for customer satisfaction. And while some large percentage of the machines that make it into the wild are fine, no one wants to be THE LUCKY ONE to get the bum playfield.
I have purchased just three NIB machines in the past 2 years and although I keep writing the checks, I cringe at at the thought of opening the box and seeing the playfield lottery (mentioned earlier) in real life! I have a JP Premium landing in California in the next two weeks or so, and already have my fingers crossed!