In some ways this reminds me of some of the complaints about TLJ with Snoke's lack of backstory. Most characters who are not your primary antagonist/protagonist don't get backstories. We get nothing in the OT by way of backstory for Han Solo or Obi Wan or the Emperor or Even Vader (certainly not more than we got for Snoke). And that's fine because their backstories are not necessary for the story. But in a world of exhaustive wookiepedia entries for even the most minor of star wars characters we can bring with us the expectation that we should be able to interact with the characters in the film as encyclopedia entries rather than characters in a moment in service of a story. Snoke's backstory might be an interesting thing to learn about outside of the movie, but it doesn't necessarily belong in the movie. It's bringing in expectations that exist outside of the story and baking them into the story.

What are you even taking about here? The Marvel characters have had 18 movies prior to tell their backstories and establish relationships with one another. Movies the audience is expected to have seen prior to this. I don't really see the comparison at all. Snoke's death was shocking/funny/impactful because it moved the story forward for the main character of Kylo. He was never a main character. Outside of Gamora, the deaths in this film were random. Not the result of a choice, hubris, or specific action for most of these characters. We will see how the surviving characters deal with the fallout and maybe my opinion will change, but for now, it seems like a cop out.