In BB players who play regularly [48 minutes] get the training, either ignoring those kids at the end of the bench with the potential to go far or playing them often out of position and at the cost of fielding one's most competitive lineup. There is no RL counterpart for that, and no logical one-to-one connection between training and minutes. In BB the effect of minutes played, ie players gaining experience, could be rewarded by the Experience attribute, and that would be logical. Minutes played could even be a small mitigating factor, upward or downward, in logical training coding. For example, if a player didn't play a minimum number of minutes (say 20) over a two week span, his training could be reduced 5% (choose your own numbers) to reflect a paucity of game experience. Even this would just be rearranging the deck chairs on the Titanic, though.
Your Scalabrine example is also nothing but a red herring. What logical head coach would limit his training to three players and ignore the rest, as is so often the case in BB?
The myopic emphasis on training in BB results in managers playing less than optimally competitive lineups, wasting youngsters' potential when they can't crack the lineup, wildly erratic hyperinflation adversely affecting almost every aspect of the game ... and a steady string of valid complaints in the forums about "minutes" and training, all of which seems to fall on deaf ears. You cannot really consider that well done, can you?