If there are advantages to getting alien CEVs, but we're unlikely to contact aliens because of light speed limits, or if we do, we're unlikely to get enough information to construct their CEVs, would it make sense to evolve alien species (probably in simulation)? What would the ethical problems be?
Simulated aliens complex enough to have a CEV are complex enough to be people, and since death is evolution's favorite tool, simulating the evolution of the species would be causing many needless deaths.
The title says it all.