Too bad I can only give this post one like.I'd say if it's been in every season since the first, it's the show's format.
I guess it also makes sense in universe as well, based on how they solved the Burn and 10-C, Discovery has become the Federation's rapid response, mystery solving team.
The way I see it is like this:
Discovery.
Discover the mystery.
They make... wait for it... wait for it!!! ... a Discovery!
Every mystery they'd have to uncover, everything they've had to discover, has been different each season. So I'm okay with it.
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Complaining about this is like complaining about, "Oh no! Batman's going after criminals again?!" "James Bond has to save the world from a megalomaniac again?!" Yes. It's the format. It's what they do.
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