Hey, we’ve all been there. A lot of people say “good writers borrow, great writers steal,” and those people are all a lot more accomplished so I believe it. I firmly believe that, while “there are no new ideas under the sun,” there are plenty of combinations of cliches or tropes that if they’ve even been done before, haven’t seen a perfect adaptation. Haven’t told an ideal story. Haven’t been used to their fullest.
This is all a long way of saying that taking apart (or working from) established stories has some merit. After all, further iterations on the most popular tales give us polished gold nuggets–and those are the kinds of stories we remember.