In many cases, the lack of a steel plate on the dropout, at the hub stop, causes wear on the dropout itself.
Over time, this causes misalignment of the wheel which, in extreme cases, causes the tire to rub against the chainstays.
Doktorbike uses a lathe to make custom-made stainless steel bushings, which are set (and structurally glued) onto the dropout, thus solving the problem at its root by preventing wear on the stop.