Probably the reason is that so many of Liszt's pieces frequently end up becoming "conservatory anvils". The younger pianists after graduation then continue bashing them as such instead of rethinking and recasting them through more artistic playing. There is nothing like listening to the real masters from the Golden Age of Piano play these works.
Well said, my friend!
YoungPianoVirtuoso, I think there is an inverse proportionality in music. Your list ranks increasing order of technical difficulty. But, musically, the order is reversed. There are many great pianists who are technically brilliant, but a few ever achieve commensurate musical prowess. Let the music do the talking, not the notes.