Something I need to clarify here is that the issue lies completely on NEC. Anyone that actually looks deeper into the system can understand that NEC was unbelievably incompetent and was basically the proto-Sega in terms of fighting within themselves over what to do. The Turbografx's overseas selection? At one point was handpicked from the CEO's daughter, who had absolutely no clue what she was even looking at. It was a total shitshow.
Come the PC-FX launching, and while it was an attempt to cater to the system's strengths of video playback (remember, FMV was one of the biggest crazes in 93-94), NEC put up tight restrictions that all games must have had it incorporated in some way, which put Hudson in a quandary and prevented some of it's bigger names (Adventure Island, Bomberman, and the PC-Engine mascot in Bonk, for the major examples. Arguably the only ones that did was Galaxy Fraulein Yuna and Tengai Makyou.) from getting onto the system. Given how long animation takes to make even back then, and there's the core reason why it rivals the Atari Jaguar in a number of categories.
I made a video on it back in December, and it's about as detailed as anyone's gonna get when it comes to it. I'll drop a link if you're interested.