Why all the Spoiler tags all of a sudden?

Discussions seem to be getting littered with spoiler tags put there by the mods and a lot of the time the things that they are covering up are not spoilers:
This is not a spoiler. It is just basic information about the game.
Why is it okay to give details of the new NPCs who will join your party but not okay to mention the old NPCs who won't?
Imoen won't join your party
This is not a spoiler. It is just basic information about the game.
Why is it okay to give details of the new NPCs who will join your party but not okay to mention the old NPCs who won't?
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I must rectify this immediately... after my nap.