Meritocracy: A system in which advancement is based on individual ability or achievement.
If you think the most able individuals are creating and running the largest organizations, and know whats best for those organizations, why would you want the state to allocate those resources upon death of the individual?
Also, most people have a time span much greater than their own life. I know I do. If I knew I wasn't able to leave a better life for my decedents, I wouldn't work as hard. If you have a wealth creation mindset (wealth is created) then this would be devastating to productive individuals