[pharke]

> killing the soma is on the surface such a massive waste of resources

How is it a waste of resources? Evolutionarily, the goal is to produce another successful generation who then begets another generation and so on. The rate at which that happens is a balance between what is necessary to confer the best chance of survival to each child, the number of children needed to outweigh the mortality rate, and the required mutation and crossover to adapt to the environment. Keeping the same individuals in circulation longer doesn't confer an advantage to their offspring since they already posses the same genes. It would more likely hinder the propagation of their genes by taking resources away from their progeny and competing for mates, territory, status, whatever.