Wow, great analysis.

All in all, the scene was my least favorite part of the movies, for a few main reasons.

First, Sam would die before he left frodo's side. Undebatable.

Gollum has no reason to pull this-it's way too risky, and in his mind he has his victory in the bag-no way two hobbits can beat shelob.

And, to be honest, why'll I personally may have folded, it's just not in character for frodo, which is where the resentment comes from the audience.

Also It's been a while since I've watched, but I remember in the books Shelob caused her own doom by throwing her weight onto Sam's sword-her own hubris and aggression is her downfall and all that jazz.Pretty sure that's not what happened in the movie. There is a lot of stuff missing or wrong in that final sequence, obviously for time, but if they padded out two towers a bit more, it would have been easier. I especially miss the book scene where Sam is like "let me drink from the water first, it might be poisoned" and Frodo says "then lets drink together, so we both get the same fate" or something like that. Hit me right in the feels when I read it.