It may be faster, and set up the elastic effect for guard skills, and be relatively cheap on the salary when paired with OD compared to, say, outside shooting, but it only trains... uh, twice as many players? But at least it is most useful when paired with an inside/isolation offense, which means that you're really not as well set up to use the ... well, most useless offenses in the game.
So, uh, yeah, removing my sarcastic hat a second, there's a reason why inside offenses are the rage and you have to be a tinkerer or crazy to run an outside offense - the game is simply imbalanced and the effect of 1v1 training is a major contributor (as is the foul/rebounding discrepancy in inside attack vs. outside, the curse of the "open" outside shot, etc.).