All games do that. TF2 specifically has 'undocumented changes' because it would be too long to list every single detail.
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Not a big deal, but I too would like it if they just listed all changes (I think Diablo 3 does that). So in a way, it is like an added perk frequenting the forums, but for some that do not, I can see how they would easily miss a few things.
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I'm more interested in the changes that I'd no clue were an issue, goes to show how much Bungie looks into things.
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Yeah, it's just fun to find that stuff!