I would agree with you, but because most of us haven't been given the chance to actually test drive a Gravity, we don't really have a basis of comparison.
On paper, and on the videos, the Gravity is far superior in performance. But once again, not having the opportunity to verify for ourselves, and the completely undetermined wait times for any type of delivery, have helped make this decision.
If we had driven the Gravity and verified that it outperforms the Rivian, or if we actually knew our Gravity would be delivered before August (our hard stop date), then we may not have made this decision.