Gen 4 new moves added
Answers
While it would be nice, it's not critical. As long as there are a few choices for the fast move, pick the one that does the most against your selected target. Clearly Confusion will do better than Charge Beam against Giratina (resists Electric). Sure, a fast move would make it easier, but until we get one, ....
I wonder how could they correct that at this stage other than introducing Fairy Wind. If for example Draining Kiss was changed into fast move, how would they keep the current mons that have it as a charged move? Perhaps by implementing the "closest better match" that the mon can learn, like Dazzling Gleam or Play Rough? Would any trainer ever complain about such change, once it is an absolute rubbish move?
I haven't checked but all mons that have DK as a charge might not be able to learn DG or PR. But there really isn't any real problem with letting old mons keep their legacy charge DK that gets replaced by whatever in the movepool. It might look a bit weird to have a mon with a charge move that has the same name as a fast move, but it also looks weird to have a Chansey with Psyshock or Omastar with Rock Throw since they were never even supposed to be able to learn those moves.