Hi Ted,
I'm glad you enjoyed hearing this piece. It's true that these etudes are quite different in character if compared, for example, to Chopin's etudes for instance. Chopin's etudes were for agility in the left hand, playing on the black keys, playing without pedal, playing long arpeggios, etc. I believe that Kosenko tends to focus more broadly than on one single point of technique at a time.
So what enters these studies? Quite a few things actually. You already noticed one, being "counterpoint free". There are moments when the RH and LH match up in counterpoint, but way more often, as you suggest, we're looking at polyphony. There we see the absence of counterpoint through the use of rests, ties, subtle rhythmic changes, alterations in phrasing, and above all, keeping the cantilena line in the forefront and taking the breathing of the soprano into consideration as well. And interestingly, suspending the melody momentarily per the score to allow the polyphony in the left hand to play beautiful solo-like nuances. Chopin would have loved the "chains of trills" that form the climax of this piece, ending in that small-note cadenza. I wanted a continuous sounding of trills, so while moving from one trill to the next (with hand position changes), I took the liberty to fill in the "gaps" with tremolos. Kosenko would have been OK with that--being resourceful. And less I forget, there are also some tough leaps of the right hand. It's not that they are long leaps, but the faster the tempo the more challenging they become. A couple of times in executing those, I nearly ended up with "ghost notes".
Anyway, that's what I got out of the etude. I've played beaucoup Late Romantic pieces, so was well aware of the stylistic challenges. But there are other pianists I'm sure who would benefit from honing their technique in this music.
Thanks for listening and commenting!
David