Interesting point about the Alekhine/Znonko-Borovsky letters from the "Shakmatny Vestnik," but I think the debate wasn't about Morphy himself, but about the source of Morphy's undeniable strength. Alekhine claimed Morphy's strength and beauty came from his deep positional sense, while Znonko-Borovsky saw Morphy simply as the sublime tactician.
Here are some excerpts (the actual debate which is much, much longer and involved. It was a little snide, as well as a source of forceful arguments from both sides:
Alekhine: When he encountered players of his own class, he no longer achieved victories with these rattles [cheap tricks or combinations against players who can't defend -batgirl] His strength (and the real beauty is in this strength) consisted in deeply thought out position play, chiefly of the aggressive character, and ln longer, of course, in 'effects' capable of bringing indescribable rapture only to beginners or those who, right up to old age, were unable to advance from a corresponding stage of chess development."
Znonko-Borovky:"I think such an appraisal is essentially erroneous, very harmfully alluring to "those fellows" [Alekhine's phrase -batgirl] the 'beginners,' and more that that, very out of date, so that Mr. Alekhine himself in the given case is not advancing from the stage of development which chess players reached way back in the days of Steinitz (for it was the view of the latter that Moprhy played 'beautifully' only against weak players) . . . And so it is with Morphy. Combinations, sacrifices and threats must have flashed in his mind during a game like showers or sparks.... out of nothing he created magic worlds of irresistible assaults, and what is there t0 say here of position play?
It's curious to note that in his "Art of the Combination" Znonko-Borovky gives 7 illustrative games of Paul Morphy.
I would like to add Alekhine became top world chess player and world champion, so Alekhine benefit greatly from studying Morphy's games, while our dear friend Znosko-Borovshy was just a strong master; I remember reading GM John Nunn, he just beat a GM and the GM said to GM Nunn, I didn't see that attack coming. GM Nunn, reply, You must not have study 1001 how to checkmate from Fred Reinfeld. A lot times is what we study we are able to create a masterpiece or win a game that at first seem impossible.
https://www.chess.com/blog/batgirl/barnes
I always love your articles, my fondness for past masters its personal passion; Barnes vs. Falkbeer, Barnes is fine positional feel is incredible adding to his defensive skills and endgame technique, I enjoy play through that game.