It is carelessness though, you did confirm you received a notification just did not act on it. How can that not be considered careless on your part? Careless would be opening the notice before hand and not doing anything. This was not the case. The notice was not opened till after a little over a week from when the first notice was sent to promo mail outside game. This is why the in game notice is also needed thus the post.
"Also what I mean by at the core I do not see the difference is because both serve to act as a warning for the player in question. " if you see no difference than adding it should also not matter to you.