Some of the early versions of the Transcendental Etudes didnt need revising and in my opinion were better than the revisions. No.10 is the one that instantly springs to mind.
In his earlier operatic fantasies, notably works like the Niobe, i think he could be accused of gratuitous virtuosity, but that is not a critism and nor does it lessen the effect of any composition.
Many concerts were ended with "send them home happy" showpieces
If the same musical effect could be had by more simplistic means, I don't think gratuitous is the wrong expression.
Liszt in his 20's wasn't the finished article nor was he too refined.
He was a product of 1830's musical scene.
Many composers used "display" in some of their works:Thalberg- Moses FantasyParish-Alvars- Norma VariationsKalkbrenner- Effusio MusicaPaganini- Le StregtheDreyschock- Concert Piece Op.22Henselt- Donizetti VariationsTausig- Ending to Chopins 1st piano concerto.The list is endless.
I think you should stick to the Plinkers.
Your expertise lay with the plinkers.
By the way, I was a "Lisztian" (if there can be such a thing) from around the time when you were a small child and I still am;
Wisdom does not always come with age.
Having played a 1846 Erard, I am not sure i concur with your initial statement.