Good game loops can last for years, procedural fetch quests can be fun if there is a layer on top of it like reputation.I think we're not fully there with procedural quests and activities. Stuff that enriches the world but is "endless". Games have an end when the story finishes, but some games can go on forever, like Minecraft, Valheim, NMS. They just lack more worldbuilding and story support. Who's gonna write the endless stuff though? We had a bit of hype around AI storytelling, but that has its downsides, too.
Bounty hunting is a fetch quest, get A at location X however if the game mechanics don't support it, you end up with the same kill X at Y
so you need a mechanic where you can take someone alive and bring them with you, hence the brig, cryo chamber etc.
NPC routines are massively underrated in a RPG game, if all NPC's had a routine and could move around in the world freely, tracking down a wanted person could be a lot of fun, RDR2 is one example, I think GTA also have NPC routines to some extent, heck even cities skylines got NPC routines, that's just one example of a game loop that could last for a very long time combine that with a reputation system and another way to deliver missions like emails on a computer in your outpost, I mean it's not that hard to make with tools already in the game, the problem is I'm not very good at coding, if I was i would do it myself
My point, what did they spend 400 million USD on?