They are too emotionally powerful and pull our collective focus away from the science.
It frames the problems we face as impossibly bad and tragic, which makes some people give up, while others want drastic experiments that can cause more harm than good.
We don’t yet (collectively) know what to do with this knowledge. It is a reorienting time. Memes are one way people are trying to orient, they are probes being sent out to encounter reality.
But I agree with what you’re hinting at, we will step out of this place with concrete meaningful steps. And science is a very good way to find meaning.
This cheap “awareness” doesn’t help solve problems, it creates conflict between people who like the tragedy stories and people who don’t like them, neither group really having much understanding or ability to think critically about the issues at hand and then... The only thing that gets talked about is the conflict and the taking of sides.
But... isn’t your comment doing just the thing you are saying is destructive? Are you woke to something here, which is animating you, and it’s not exactly based in evidence?
What I mean is that when I think of when I would say "the ocean is dying," I'm referring to things like declining fish populations, coral reefs dying off, and the oceans themselves getting warmer and more acidic.
These things are undoubtedly happening. We have measured them, and we are causing it. Your link seems to say something like "the ocean isn't dying, because we still can do something about it." I'm not particularly concerned with this "ocean health index" they mention. I am not concerned with what we "can" do; I'm only concerned with what we are and will be doing. And, at this rate, what we are doing is not enough.
The point is that the oceans are large, there are different concerns, and conditions vary across location and species.
If you want to answer a question like "how healthy are our oceans?" you need to first work out what that might mean, and then measure that systematically like the project I linked you to.
In particular we need to convince governing bodies that action is in their direct and immediate economic interest, which again takes data.