1. Non folding stem: Adds durability for a rental, but the super quick fold is a huge part of the appeal of a scooter, because it means you can easily take it with you on the train, put it in the trunk of a car, or store it under your desk. If you didn't care about compactness, you'd probably buy an e-bike.
2. Huge battery: Adds to the cost and weight, which makes it more annoying to carry. Great for a rental where Bird is paying per charge, but very few people need to ride 30 miles between charges, and for those that do, they'd probably rather have an e-bike that is faster and more stable.