If training was easier, top rookies (and even mediocre ones, as long as their potential is high enough) fresh from draft would sell for even more than now. Much more. Talking about inflation...
Anyway, in my opinion it is not THAT hard to train, or even train & compete. But it helps if your trainees are not of the same age - if, for instance, you have 25, 22 (league games) and 19 yo (cup/scrimmage) trainees, it doesn't affect your competitive abilities too much, as long as you train well. When you finish the oldest (at 28), you add a new one and so on.
Oh well, just a thought
You still have to grind a player for 48 minutes, not using a backup will lower the quality of the production.
Training system is and always has been stupid.
Größter Knecht aller Zeiten aka His Excellency aka President for Life aka Field Marshal Al Hadji aka Lord of All the Beasts of the Earth and Fishes of the Seas aka aka Conqueror of the Buzzerbeater Empire in Europe in General and Austria in Particular