the only real difference between 3d and isometric i see is that in an isometric perspective there tend not to be items hidden by the camera angle, i say tend because i absoluteley know some games that are isometric that can have enemies hidden by perspective (see Synthetik for a recent example)
Likewise, 3D graphics can have a fixed camera perspective and a design favoring visibility.
as such, yes i think this discussion is pedantism.
