Potnia Theron observed that journals which impose limits on the number of citations that can be included in a manuscript are getting it wrong.
I agree, totally ridiculous. If the manuscript is egregiously overcited, the editorial and review process can handle it.
The drawback of such policy is palpable. It necessarily will prioritize particular papers (Glamour? First?) and obscure others. It hinders the process of citation thread-pulling which is an essential feature of scholarly reading. As such, it will slow the pace of science.