Another argument for vector utility

Diversity. There are multiple niches, multiple ways to improve a creature's fitness and increase its chances of survival and spread. Beneficial traits, different adaptions, like protective coloration, larger brains,  etc.  Different creatures may find very different ways to improve.

AI alignment/safety

If humans and AIs are to peacefully co-exist it is not a matter of giving AIs our (rather poor) set of values. Rather, human values will also have to change (improve).  

The further evolution of intelligence

 There is an upper bound placed on human brain size by what can be pushed through the birth canal. There is a lower bound placed upon the human computing elements by minimum cell size. There is a speed limit placed upon human computational processing by neural electrochemistry. Nonhuman processors relax all of these limitations. This all favors mechanical life.

Specialization as attention

 For a long time I have stressed the importance of attention and explored various attention mechanisms*. Agent specialization is an attention mechanism as well as an approach to reducing complexity/dimensionality**. There are some senses/sensors a given specialist may have no need for at all. Specialization is attention to some specific set of skills/tasks in a particular environment.

* See, for example, my blogs of 1 June 2011 and 3 January 2018.

** See, for example, my blog of 1 July 2023.