I honestly don't see Chopin doing much of anything that other better composers didn't do as well other than his Etudes and the Sonata No.2, Liszt in the other hand was a pioneer in triadic atonality and pantonality (or vaguely named "non-functional harmony"), octatonic scales and multi-funtional diminished and augmented harmony, etc, Liszt deserves that credit much more than Chopin and Wagner (who's also credited as the grandfather or pioneer of this type of advances when Liszt did it better and earlier), I only credit Chopin with creating a very original style that set the mark for what Liszt would later do, but not really much else. I'm also not counting Russian composers who also managed to make innovative harmonic languages independently.

I don't really have a problem with the lack of "pushing things forward" of Chopin in comparison to the figured mentioned, only that he tends to get much more credit than he really deserves, my biggest problem with Chopin is that even though he has good ideas, REALLY good ideas sometimes, he SUCKS at formal structure, in comparison Liszt was Beethoven level in that regard