most vehicles on the road are front-wheel drive. During fair-weather non-aggressive driving I doubt most people could tell the difference.Also, how much would using front wheel drive only affect vehicle stability and safety while driving on pavement? Inquiring minds would like to know. Guessing we are not going to know these answers until Rivian decides it is time to release their EPA numbers. Thinking, with deliveries beginning this month, its time to release this information.
Now in situations with inconsistent traction (such as bad weather or loose gravel/sand) the AWD is going to be noticeable; and if you're pushing the vehicle through curves then torque vectoring is a huge advantage.
On a side note, I'm thinking that torque-steer -- something that affects most FWD vehicles that make decent power -- shouldn't be a problem for Rivian, even when operating in FWD mode, as I think the CV shafts are equal-length.