This is the case in literally every other disney movie.
Most Disney movies are not modern, and most of the modernish Disney movies have princes lacking in charm. The last one that has a competent 'prince' is probably Mulan, which came out 15 years ago.
you might as well ask "why do Romeo and Juliet have to die at the end of the play, it would be a much better story if they lived happily ever after."
Yeah, I'm not sure I'm that happy with a story where ignorance is the primary driver of suicide.
Flynn Ryder (from Tangled) is actually pretty competent at his actual job (stealing things).
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