One of the ways in which 'modern' stories (of the past few decades) differ from literature up to the middle twentieth century - is that now the 'hero' (protagonist) of a story will nearly always fight against his own 'destiny'. And, indeed, that fight takes-up a good deal of the narrative.
Thus if the 'chosen-one' of a mythic narrative swiftly and decisively takes-up his heroic role and does his best with what ought-to-be done (like Frodo) - this is regarded as unsatisfactory. But if the appointed-hero struggles (at length) against adopting his role, if he is tempted strongly to abandon it, if he acts in violation of his role and needs to be brought-back... this stuff gets a writer critical 'Brownie points'.
Struggle-against-destiny has become the usual thing for a modern hero.
My impression is that this inward fight against what he (or she) ought to do, is expected and approved-of by those who consume and comment on novels, TV, movies etc. For instance; introduction of this self-doubting, inner-conflicted element to several major characters, over and again (Aragorn, Theoden, Faramir...), was perhaps the major distortion of the Lord of the Rings movies, compared with the original fiction.
If such inner conflict is not present, the writer is likely to be accused of childish simplicity, of having 'black and white' characters; whereas a hero divided-against his destiny is regarded as complex, subtle, realistic, mature.
But the anti-heroic-hero is not a wise Man, nor is he a Man who is consciously adopting what he regards to be the highest path. The focus of stories is moved away from what needs to be done - and trying to do it; towards inner psychological - even psycho-pathological - rumination and conflict.
Drama has become psychodrama - myth has become a psychoanalytic explaining-away of myth.
What this means, when repeated again and again stereotypically and in context in which the 'hero' is implicitly admirable, whatever he does (so long as he is in at least two-minds about it) - and when the 'embrace my destiny' hero is excluded; is that the question of a Man's proper aim of life has been deleted; the possibility of wisdom has been deleted - because wisdom is to know what one ought to do, and to do it as best possible.
Furthermore, the anti-hero makes all stories mundane - all are diminished to the level of endless soap operas (who are eventually driven to deploy this 'inner division' to permutate character motivations and actions over the long term). There can be no real 'myth' or 'magic' - because mythical and magical characters are excluded.
A real, wise hero is not one who wallows interminably in uncertainty; nor one who is only compelled to - finally! - do the right thing by elaborate coincidences of external circumstances, or the harsh (yet, somehow always reversible!) lessons of selfishness, short-termism, hedonism and cowardice. Wisdom is - by contrast - knowing quickly what is needed, and then doing it as best possible, despite problems.
In real life - as we used to know - it is not the mixed-up, self-indulgent, inwardly conflicted Man who does the right thing and saves 'the world' - and fiction cannot convince us that he is.
Instead, we take-home, absorb and learn a message that there is no real heroism because there is no real destiny: because there is nothing to be heroic-about!
We learn that action comes from mixtures of self-centred motivations and external compulsions; and the sophisticated, admirable Man is one who talks extensively about his feelings and paradoxes - such as the incompatibility of the things he wants (home and adventure, flee or fight, wife or mistress... whatever).
Since the best fiction is also a kind of vicarious experience; the conflicted anti-heroic protagonist is likely to be worse than useless (i.e. harmful) as a model for how we personally ought to approach this mortal life.
But unfortunately, writers have become addicted to this kind of protagonist; because the delay in adopting destiny, and 'getting on with what he ought to be doing' can be spun-out narratively for astonishing periods: many volumes of a book series, many episodes of a TV programme, most of a long movie...
When a writer is praised for such shameless and easy padding-out of stories; little wonder that so many succumb to the temptation - and thereby contribute their mite to the corruption of Men and culture.