This rule is not about trust.
Its about protecting people from thieves.
So then this rule wouldn't protect us (ordinary users) from NT/U21 coaches who are thieves ;-)
So this rule isn't needed if it protect us from one type of thief but at the same time open possibility for another type of thief ;-)
It wouldn't benefit me in anyway
It isn't 100% truth. One of Japan U21 player is Your player. So Your merchendise increases. Maybe Your player plays in U21 instead of discussed player ;-)
BTW the buyer of the player DID email me to ask
Still You don't understand that rules should be created to general case, not to specific case.
Maybe he doesn't trust You ;-) I think many people could consider that You spend to many time to complain current rules, engine, etc on forum instead of to try to exploit current rules and therefore You knowledge about U21 isn't as good as it could be ;-) He has right to think that You made wrong decision ;-)
I know why this discussion is so hard. Because it is discussion between two users, and one of us has better knowledge about NT/U21 than 2nd of us ;-) If You know what I mean ;-)