This game has a GREAT opportunity for a hardcore mode to be unlocked after progressing far enough in the base campaign.
I’m imagining a permadeath gamemode where the player gets randomly spawned into one of the bunkers throughout the map, pre-cleared and making that the starting point for the players journey. The players would loot the entire bunker before venturing out. Adrenaline shots still work as is but death without adrenaline starts you over.
Hardcore mode also doesnt have a GPS map in the menu. Hardcore mode doesnt change the damage distribution or anything like that, it’s just how you start and end that changes. All the missions could remain as is. If anything, boost the xp gains in hardcore mode.