When I last walked her, a week or two ago, I didn’t want to use the choke chain on her so I put on her harness and used a regular leash, and she did great on quiet streets, in the woods, and on busy roads (walk included all three). I don’t know if anything has happened since then to make her unwalkable, but she goes insane when she sees me (I give her bellyrubs and have she has never had a negative experience with me) so maybe she’s walking better otherwise.
I don’t think that they usually use the flexi, I think that they grabbed it by accident in a haste to get out of the house bc she just came out of her crate