Even then, by creating this special category, you're defeating your own argument that julia won't be able to be schrewd enough because she's lousy at warfare.
In fact, I am not. Just read ADRPG, p. 22, first stanza of "The Potential of Warfare."
But the circumstance that someone with obviously lower Warfare can still trick someone with higher warfare sometimes, is the reason why I am using skills in my game. Whereas a point in a skill equals three points in the corresponding attribute. The skills are specializations of the attributes and the effective value of the skill is skill + attribute. Thus noone needs to take skills, a generalist is better off only investing in attributes. Still it allows a human character to beat Amberites in some aspects, without being of equal overall power in an attribute (Shadowdwellers pay double for attributes above Amber rank in my game). But that's again just another house rule.
Apart from that I give boni for creative player ideas on the attribute/skill - whereas I am with you. Of course good roleplay and creativity has to be regarded. If just to keep up the motivation. Still a good idea often only helps for a few moments until the better (N)PC (in skill/attribute) adapts to the tactics. E.g., if Benedict had somehow avoided Corwin's plan to be pushed back into the vampiric grass, he would, over a short period of time, have noticed, that there must be something fishy about that patch of grass as Corwin tries to press on into that direction. He then would have had the chance - as the better swordsfigher - to use Corwin's tactic against Corwin himself.
Nonetheless my opinion is that Erick created a game with two main concern in mind: simplicity and playability. He did a fantastic job at that. Roger Zelazny wrote hos books not thinking about how Erick's rules would explain what happens, he wrote to tell a story the way he thought it was meant to be told. I love diceless, heck, I adore the beauty of it, but some of the things that happen in the books would be best explained by randomness, which is not part of diceless. Does that make diceless inferior? No, it doesn't, it creates a different world, tho.