Where do you get this definition from? Not in the rules. The rules use the word "quirk" and does not say unintended anywhere. I associate it with complicated techniques because the only examples listed in the rules on this topic are complicated techniques; banner transmigration, nudging guards, blocking enemies with barrels...these are very complicated techniques. And Galaer, if banner transmigration is mentioned in the rules as an example (as in Garrett physically moving through banners in order to end up on the other side), why aren't taking objects through banners, windows or doors also mentioned? These certainly are much more common occurrences than being able to penetrate the banner.
This isn't about trying to find every single instance in missions that are unintended and disallowing them. If so, then mantling up to the top of rooftops in areas that the author didn't want you to go would also qualify. This is about stopping the player bending the engine in exploitative ways using techniques developed during the early years of ghosting. That's why the rule was made in the first place. If those techniques hadn't been developed or possible, I doubt the rule would even have existed. It seems like you are trying to accuse me of just excusing busts here. What I am doing is trying to figure out what the rule is covering, and I'm basing that on the examples laid out in the rules.
If I am mistaken and this is supposed to be covered by the rule, then I will adhere to that interpretation, but I will also say I think the original rules then were written sloppily.