“In reality, experts say it is often mental illness and stressors that lead to suicide, although the show does not touch upon whether Hannah has mental illness,
People Are Questioning Whether Hannah Baker Even Had A Mental Illness
Carly Cassella

Wow, this totally misses where the mental illness comes from. I haven’t seen the show, but from my pov nearly any suicide is caused by some kind of mental illness which in turn is often caused by environmental aspects, like being mobbed, stress etc.
So there is no reason to explicitly highlight mental illnesses, especially if the person never gets diagnosed/treated wrt. them in the story.

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