Writing that is "things happen to main because the main is the protag, and all roads lead to the protag, no diegesis needed" is bad writing.

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Writing that is "things happen to main because the main is the protag, and all roads lead to the protag, no diegesis needed" is bad writing.
There's a lot of heavy lifting under "diegesis" there. If the story is a satire, picaresque, or a pornography, we can forgive this kind of writing. But all of those require clarity of purpose.