First karaoke add-on (ROMROM Amp)? Maybe.
As for it pioneering the "modern" era, that depends on your definition of modern. Certainly the Playstation and Saturn owe a lot to the PC Engine, but with systems like the PS3 and 360...honestly the discs the games ship on are just a formality, IMO, since updates sometimes nearly a GB is size are required for most top tier games every other time you turn it on. Game delivery and storage is mostly the internet and the hard drive. We have MS to thank for that, more or less.
It seems like Nintendo is the only company with the confidence to ship a finished product on a fixed disc.