Quoted from ForceFlow:
Huh, I'm actually a bit surprised at the amount of CNCed playfields and cab parts. I didn't expect to see any stockpiles like that.
I'm not. If you've read the comments from former employees, it sounded like Robert really was trying to push out like a dozen playfield layouts simultaneously, hence competing with his own games. There's a reason why Stern only releases one title about every 3-4 months (and doesn't let the upcoming titles leak). They want you focused on what's available RIGHT NOW.