  Rohrlich's recent claim that the equation of motion for a point charge be
symmetric under time reversal is shown to be the result of an unusual
definition. The equation of motion for a charged sphere of finite size, which
in contrast is claimed to be asymmetric because of the finite propagation time
of its (retarded) self-forces, is shown to possess the same asymmetry (or the
same symmetry, depending on the definition) as that for a point charge. Similar
arguments apply to other effective equations of motion (such as those
describing friction or decoherence).
