Often they have complex political or even propagandistic undertones. For example,the trope of the ‘angry black woman’is often criticized for falsely representing BIPOC women as inherently aggressive in a way that dismisses history or the nuances and responsibilities of representation. Another stereotyp...
The nice thing about flat characters is they don't need a ton of effort to perfect. And most writers have developed instincts for all character types through reading and writing. So if your instincts say that a certain type of flat character will work best in your story, follow that instin...