  We consider a specific generalisation to spatial dimensions d greater than
one of a formalism based upon conservation laws and the associated Ward
identities, that exactly solves the one-dimensional Luttinger model, and expose
its inadequacies for d > 1. We conclude that findings arrived at through
application of this generalised formalism concerning systems of fermions with
strong forward scattering, in particular that d=1 would be the cross-over
dimension from Luttinger- to Fermi-liquid state, are open to question.
