I am arguing that, I'm afraid. It doesn't really bother me that you think I can't.
("that" = "that Decisive Battle is inherently incapable of working" and/or "doctrine itself is illegitimate")
Okay, well, I don't consider that position to be something that needs to be debated on its own terms "in-universe". All doctrines are legitimate, useful choices, because this is a game and if they weren't legitimate, useful choices they wouldn't be presented to us. It's inherently capable of working because this is a game largely written narratively, and if the QM think it's reasonable for decisive battle to work then it'll work.
We've been told some doctrines will oppose each other more effectively than others and there will be adjustments depending on the situations we're fighting in, so if you wanted to argue that there's more situations/enemies where Base Strike will be useful then fair enough. (Decisive Battle will apparently be adjudicated as working less well against Fleet-in-Being, and Base Strike less well against Forward Defense.) But "Decisive Battle is incapable of working" is just axiomatically untrue.