The dinner menu and guest list for royal functions over 100 years ago was (and may still be) redacted by the state in the UK. Sometimes, secrets are not really about very much.
I am personally more interested in the MLK data than the JFK data because flawed though they were, the many eyes on that prize didn't find even the scent of a smoking gun worth much. If it had been the other side of the Iron curtain, by now they'd have capitalised on proving it. The ability to tie that era's democrat party to the mob was too delicious to keep secret if provable. (yes, even being killed by the mob taints you with the mob) so either political, foreign, or crime related I can't see how successive governments could have resisted showing-and-telling all.
MLK, I felt was swept under the carpet the way decent "folk like us" wanted. The moment of political advantage in the facts faded much faster, the underlying unease of what agencies of the state might be complicit remains. I think we all deserve a bit of clarity here. We know he had feet of clay, thats not the point. The point is how poorly the state defended a man trying to build a better america.
Neither are anything like as important as current events. The release is not just a mechanistic "I am a man of my word" moment, its a distraction from the everyday events. Any hour news online dedicates to these stories, is time not spent worrying about what dismantling the US state means in practice in 2025.