I agree to an extent. For example - When you think about how the Spurs players are perfectly rested and preserved for the full duration of the season so that they're at their peak when it matters, you want that for a guy like Lebron too. Along with his co-stars. Especially his co-stars.
But Lebron, for the supreme athlete he is... He is approaching 30. Has been in the league 11 years. Didn't get the few years of a lighter college schedule. Plays major minutes while carrying the load for all of his teams. Plays an extra 20-30 games every year with postseason play. Plays on the Olympic and national teams during the summer. Never misses significant time to injury that I can remember (which can shorten OR lengthen one's career with rest).
Etc. Etc. Etc...
Yet at the same time. He seems to keep getting more and more statistically efficient every year. It's really remarkable. It will be interesting to see how well he maintains his health and conditioning throughout and after his peak if he keeps up with this pace. Yeah, he's arguably the most blessed/gifted and well-conditioned athlete we've ever seen, but still.