UPDATE:

I had a terrible experience on an Albany/DTW regional flight a week or so ago. Wrote in to Delta and again complained about the lack of options and told them I would be switching to another airline for my Albany->GRR travels. This was probably the third complaint I’ve made to Delta.

I went to check booking options today and LO AND BEHOLD, an Atlanta connection is again listed as LEGAL.

Im SHOCKED (and hoping this isn’t schedule-change-Saturday shenanigans) but it seems my complaints were listened to and the route reinstated.