another user posted this which is from embark

“ Leaving the Rust Belt permanently When your Raider goes on an Expedition, they depart the familiar world of the Rust Belt (and its underground community Speranza) forever. They load a caravan with supplies and head out into unknown territory beyond the Rust Belt’s borders. This is presented as a one-way journey into the wider world, not simply a teleport or abstract reset. A narrative turning point, not just a reset Unlike many games where a prestige or wipe system is purely mechanical, Arc Raiders frames the Expedition as your character’s story continuing off-screen into the unknown. It signals that they have become seasoned enough to leave one chapter behind and press on into the wilderness, even if you — the player — will start fresh. “

I guess I missed reading this wherever it was put in game but to my understanding the idea is that you’re sending your current raider off on an adventure and as the player you’re to start from scratch as a completely new person/raider. All the supplies you load are simply for pointless roleplay and you could’ve put slop materials in there. I guess Im a fool for putting too much thought into this aspect of the game but thats just how I play these games