Plenty of folks have contributed valuable ideas and innovations over the years. But framing it as "moving the art forward" implies a linear progression, which isn’t how creative endeavors work. RPGs aren’t technology where newer automatically means better. Older systems can still produce compelling play today, just as they did decades ago.
This isn’t unique to RPGs, it's true of music, literature, and visual art as well. Creativity expands, diversifies, and branches. It doesn’t march in a straight line. So assertions that one approach is “forward” just because it's newer misunderstand the nature of creative development.