Considering the amount of pure unmitigated crap that gets posted to Stack Overflow nowadays, it's not just okay, it's necessary. Curators are expected to manage that Sisyphean workload with the equivalent of sticks and stones; getting upset because they build a tool to help them, and that tool is imperfect, is unhelpful at best and discouraging at worst.
Until or unless we get many more curators or far fewer questions, we can only do what we can do. And that will, sadly, result in false positives. Don't blame the curators for that - blame the company that has forced the necessity of inventing such tools by refusing to provide better tools.