No, I don't think so, because, there's not so much activity in the classic dungeon crawling besides... crawling itself, so, fight with the "one button" (like, say, quick attack in the MM6+) oversimplify too much the gameplay (retro sentiment aside).
"Flaw", mind the comas, means ergonomic "flaw" in the modern sense. I mean, it's like "automap" option. Yes, it's "retro" anticlimactic (also, simplify the gameplay), yet, at the same time, lack of this option, turns off from the game much larger population of gamers, than lack of "one-button" attack. First is a just time saver (for an adults not having too much time), second is a mere inconvenience/cool strategic option/sentimental value for the most of players. Inconvenience isn't a "flaw", loosing players is a flaw.