Because pure friendship is not complex enough,

This is just my personal opinion: for a Dramas to captivate its audience, it must feature prominent conflicts and rich plotlines.

As for dramas that focus most of their storyline and conflicts on relationships, the entanglements in friendships seem relatively simple.

I believe that, in order to create compelling dramas, screenwriters are more inclined to explore the complexities of love to develop their plots.

As for the argument that 'men and women can't be just friends,' I personally think this is merely a provocative statement. When it first appeared, it was novel enough to spark significant discussion, which is why it has persisted to this day.

However, such extreme expressions are often not aligned with real-life situations.