I agree that it should not be supported or encouraged...except that it is encouraged, by requiring 48 minutes to train and only allowing one position at a time for effective training.
In my perfect world, training would not be by position, but any 2/4/6 players you choose each week on a sliding scale of training effectiveness. This would also mean we wouldn't have to play our center at point guard to train his passing.
How convenient it must be then that there is already a sliding scale of training effectiveness - a player who plays 46 minutes still receives quite a bit of training, even if they miss some last few percentage points from the ideal maximum. Of course, two position training is also possible, to allow even more players to receive training and to allow for more easily covering these lost minutes, though of course at a lower scale of training effectiveness. Likewise, now you can train a center in passing while playing him at center, at least as of this season, again with a lower rate of effectiveness.