I lived in France for 4 years where every road was this. I love it to be honest. Supper easy to repair, great when it snowed, and not as rough as you would think.
As an owner of a Tesla Model X, this is adorable to me. The alignment all over the Model X was always bad. Even when they fixed it, it would misalign within a few days. I hope Rivian can get this working properly by the time customer production starts.
I believe the rear seat storage was confirmed for the 300 mile R1T, but not 400 due to batteries taking up that space.
As for the rear entertainment, I really hope there is. My Rivian is going to be used for A LOT of family trips and I promised myself after my last trip that my next car will...