BB hopes to let top league teams reduce the number of outstanding players trained (to replace aging players) in order to enhance match competitiveness.
Otherwise, teams could more easily overcome the generational succession and stay in the top league.
BB also hopes to let top league teams reduce the increase in on-field strength due to training in order to enhance match competitiveness.
Otherwise, teams behind will struggle to catch up in terms of on-field strength, leading to a situation where the strong remain strong in the short term (relative to generational succession).
...... can also refer to these articles (273660.21)(273660.38)(273660.39) by BB-Marin or this summary of opposing views (323722.8).
There is another one.
If we could more easily have a team as we wish, then the game would become more reliant on mastering "the most effective player skill distribution," rather than the various efforts made to build the team.
Taking training 2 players and allowing different players to train different skills as an example of more easily having a team as we wish.
In the current training system, training 2 players often requires compromise, either focusing on one player or finding a balance between them.
But if different players could train different skills with no restrictions, like the restrictions in this thread
(319331.191) for the second type of training, training these 2 players would be similar to training 2 players individually, allowing you to develop each player into the desired form.