Unit Experience

[Spuddicus]

I'm thinking this particular part is a feature rather than something wrong or unintentional, i kind of like the idea that your battle hardened vets would perhaps do the unit training themselves and pass on what they have learned to newer recruits (at a price of course).
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I look at this as a definite improvement over MTW.
I used to end up with many weakened units with high valor; afraid to retrain and didn't want to disband either (those high valor units, especially chivalric knights, frequently turned the tide of battle).
I find this aspect in RTW to be much easier to manage.