People who say "first time" in new content

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If you're referring to the duty itself notifying players that one or more players are new to the instance, it does not tell you which player(s) are new. A sprout icon also does not indicate that the player is new to the instance. I really don't know how it is so "obvious" until a player mentions that they are new.

Is it not obvious that when new content drops people will be new to it? I guess I didn't word it well enough