Pinball machines, but I'd hardly call one-size-fits-all pinball central controllers a harbinger of a brave new world of DIY control board installs. There's significant economic incentive to tinkering with a pinball machine until it works.

Ironically, the all-in-one controllers also tend to be missing some of the more popular pinball machine models, as the IP owners for those machines had the legal muscle to boss around the companies that make the all-in-one boards. As a result, some of the more popular pinball machines are dying as their control boards wear out and they cannot be replaced, because even the popular manufacturers either rotated what they make or went out of business / got bought. :-p