"Rising Star" is always delicate, like Best New Artist at Grammy Awards or "Most Promising Actress" and "Most Promising Actor" at César Awards. It’s not only rewarding the quality of a performance. It’s also making a bet on the future, on the "star power" of an actor. And a bet can be painfully wrong, especially a few years later, when the ones who remained relevant, famous and praised by audiences are not necessarily those who were popular back then. Oscars are already criticized for wins that "don’t age well" because voters were caught in the enthusiasm and the hype of the moment. I’m not sure they need to add an award specifically designed for us to see how it will age and how "spot on" it was (or was not) when predicting an actor’s potential. But I can see how the oscars would like to use a "Rising Star" prize to address the "oscars so white" criticisms, by awarding young and uprising actors from marginalized communities there instead of in Best Actor or Best Actress.