You have a point although I have kept them for 2 seasons I the past and seen no improvement.
You see the problem with giving them an entire season is that they have shelf life of 4-5 seasons, if you're lucky. 3 in some cases. So it's likely you will waste 25% of their time in the squad...that's a huge amount.
Also, I don't know about other people, but a few 4 ratings is enough to cost me valuable league points against teams as good as I am. By the time this player has adapted I may already be out of the cup/too far behind in the league.
I'm afraid long-term rationale can only apply if players are going to improve quickly enough to stay in the squad longer. Which they don't.


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