The meta just ruins the impact of those deaths though. This movie didn’t happen in a vacuum. There’s a Spider-Man movie coming out next year. There’s another Guardian’s of the Galaxy. We know the final “snap” gets undone in some way.
And unfortunately that risks undermining the other big deaths earlier in the movie, which I’m not sure will be undone. I guess we’ll know in a year.
Most obvious prediction for AV4: the survivors go multi-verse hopping to find another Infinity Gauntlet.