I’d agree that the brains of very primitive animals, or brains that have been heavily stripped down specifically to, say, operate a traffic light, aren’t really worthy of moral consideration. But you’d probably need more intelligent brains for complex tasks like building cars or flying planes, and those probably are worthy of moral consideration—stripping out sapience while leaving sufficient intelligence might be impossible or expensive.
I’d agree that the brains of very primitive animals, or brains that have been heavily stripped down specifically to, say, operate a traffic light, aren’t really worthy of moral consideration. But you’d probably need more intelligent brains for complex tasks like building cars or flying planes, and those probably are worthy of moral consideration—stripping out sapience while leaving sufficient intelligence might be impossible or expensive.