I love the ending. In traditional stories, the hero will die after completing a goal - they saved the city, cured the disease, etc. It's no different in Uncut Gems. If your highest virtue, the sum of all your effort, is the salvation of a city, and you die saving it, then a normal narrative usually frames your death as heroic. You've achieved your highest virtue, your purpose. If your highest virtue is a fucking hail mary bet on a basketball player you loaned a gem to that almost certainly doesn't have magic power, and you die having achieved that bet, then do you not also die a hero's death? It's fucking fantastic.