Yeah unfortunately DL grabbed these zombie planes and never really did anything to them. I don't even think they have power at seats, or wifi. The 73J is particularly bad with only 1 row of C+ so its going to be a sardine can unless you score an F seat which as a lot more space than a normal F seat... but only 12 in these garbage configs.
Can't believe DL hasn't and obviously isn't going to be updating these. Hopefully with the short flight lengths (used often on atl beach routes) that means the high cycles will push them to heavy D check soon.