The human brain has many limits. It is limited in volume by the needs of birth, and it is limited in power consumption. An AGI doesn't have those limits, so it

The human brain has many limits. It is limited in volume by the needs of birth, and it is limited in power consumption. An AGI doesn't have those limits, so it could plausibly be better in some ways to the human brain, even if it uses up orders of magnitude more energy and volume. The scaling limits are fundamentally different. That's why it can be worthwile.