i can't speak to philstar22's point, but for me they seem to be using the popularity of poirot/christie to tell a more generic mystery story. like i am genuinely unsure if the creators actually like agatha christie novels, because they all seem stripped of anything interesting. the last one, A Haunting in Venice seemed to be more about creating religious drama for Poirot than a mystery and since Ariadne was Christie's self-insert thoughts about being a mystery novelist, her being duplicitous in it really steamed me.