I distinguish between players I consider part of my long-term plans and players I plan to ship off or place on the bench.
If I plan to use a player for the coming seasons I would definitely let them evolve to scout level and onwards.
If a player is getting too old (by old I mean 23+) and are having problems keeping up quality wise I will lock them at 99 % in hope to earn myself a token or two.
I hope that's somewhat useful.
Kind regards.
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