:::::::::::::::::So what if Konqueror and other file managers can be made to behave like dual-pane file managers? That's not their "normal" (read "preset") mode of operation, that's why they (probably) shouldn't fall into that category. Dual-pane behaviour is part of Konqueror's functionality, not its whole functionality. You can play text-mode Tetris from within Emacs. Would you categorize Emacs as a "Tetris clone"?
As for your (conveniently abridged) definition of "orthodox", dual-pane file managers are not "traditional" in any possible meaning of the word (if there's any "tradition" in file management, that's either the shell or spatial file management à la classic Macintosh Finder). They certainly aren't customary nowadays, nor are they more "generally accepted" than other approaches. So it actually sounds like you're making my point for me there. Besides, the etymological (read "original") definition of "orthodox" is "having the right opinion", which of course is crazy when applied to any kind of software. But, again, you're missing the point: as I've already told you, the only criteria to keep into consideration is USAGE OF THE TERM in qualified circles'''.