"they open fully in really tight spots where normal doors wouldn’t"
I don't see how this helps. They're on the back, not the front, so the driver can't get any benefit. So you still always need to have room to open the doors normally.
Gotta put yourself in the shoes of a parent here. If you’re retrieving a child from the back seat, or are letting kids open the door themselves… you want something that is unlikely or basically impossible to smash into a neighboring car. Children aren’t careful, and if you’re trying to wrangle one in or out, you don’t want to also have to deal with the door. The front door you can control yourself, it’s not an issue.
I don't see how this helps. They're on the back, not the front, so the driver can't get any benefit. So you still always need to have room to open the doors normally.