The arguement about the straining minutes and lack of depth is secondary.
The true arguement would be the level of talent they have encountered at this point. The West has superior teams than the east. I'm not saying the West has more talented STARS. There are an equal amount of all-stars in each conference. Really, I think the biggest differences between the East and West are the coaches. The eastern conference, IMHO, doesn't have the quality of coaches that the west has. The Celts are good, but they haven't proven themselves, YET, to be an elite team.