Yeah, I have no problem with a scene or sequence being based on someone's incompetence or lack of experience - that happens in real life (only today I found myself begging my current employers to take on someone with the relevant skills for the work, instead of continually scraping the bottom of the barrel of back-to-work schemes.) But when the character is a supposedly top-of-their-game professional but behaving like a student who's skipped most of his classes ...