The justification has been "It's using defender numbers and I don't like that it is".
Is there a sudden interaction that's making these sets overpowered after 10 years? No. They're not oppressive or even all that common so why even bother to devote the resources to it. There are sets that could use the same level of effort to be made usable instead of rotting in the gutter(forcefield)
Nevermind the fact that is's all done under the guise of bug fixing, which should be a concern.