It was ABSOLUTELY contrived that Nat and Clint just had to be the ones to go to Vormir, yeah. They might as well have written "NATASHA IS GOING TO DIE" in giant letters on the screen. (I knew she was doomed when she said "I had nothing, and then I got this family" in the trailers.) Even if there's no giant plot hole about what Nebula knew/didn't know and did/didn't tell them, the team sent their two non-powered human members into a total black box mystical whatever situation they knew nothing about? It was ridiculous.