I still prefer retroceding most of D.C. to Maryland--and while I appreciate that people in the other thread are being honest, #1 is not the "real" reason for my opposition. It would be ... inconsistent with some of my other positions if it were.
Does DC or Maryland want that though?
It's universally known that they don't, but I think focusing too much on public opinion is a bit ... misguided. The public has supported many questionable things throughout the history of this country, and while making D.C. the 51st state is not necessarily a bad thing, I don't trust the public opinion to be always correct.
Realistically though, retrocession is never going to happen; so I suppose D.C. statehood is ultimately better than no D.C. statehood.