How are the two situations any different? If you the player know the name of the people in the game that certainly doesnt mean that your character knows the names. Introduction systems can be a convienience for players to remember with whom the character has come into contact with, but it has never bothered me personally if a game doesn't have it.
Much the same with numbers, the people I spend most of my time rping with know their exact stats in almost every aspect of their character. Of course we don't walk around talking about having a strength of 10 or a charisma of 20, but instead use the numbers to mold how we play the characters.
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