If the pollination technician isn't a sim who can walk the neighborhood, why have a trait for it? The game could just supply a picture of "mom" and some genetics for the new alien baby without having a list of traits for a non-existant sim.
If the pollination technician IS a sim who walks around, what is their purpose? How do they act differently for some random game generated alien? They don't actually participate in the abduction. The Tragic Clown and the Grim Reaper actually do something in the game.