Sorry I'm late, but:

Its very funny to me that you say this, because, I have unironically been trying to build a game that largely would boil down to: You are Vash the Stampede, basically.

Like, a reverse bounty hunter game.

You're in a decently immersive, reactive, open, maybe semi procedural world, and there is a simulated system of factions and people in thosr factions, and you are essentially a fugitive, though depending on what you do, who you help, who you don't, thosr factions could shift, war with each other, who knows.

You could also give the player various... quest-like goal to achieve. Like uh, don't do this as obviously as most games, that in one way or another basically directly tell you 'go do this thing'... instead, make these kinds of things discoverable, semi procedural, woven into the simulation of people and reputations and such.

Then, you'd have... ok, so you'd have kinda of either two classes or modes of NPCs. Most would be what we typically think of as NPCs, mostly reactive, spiced up with some base simulation of 'what gameplay purpose do I serve by being here, thats my 'goal', that's 'what I'm doing'."

But then the second class or mode of NPC would ... be capable of higher order strategizing, and would actively pursue some strategy to like, hunt you down and find you.

Quite ironically, I have the technical know how to mock this up at least, I've been making mods for decades and had a career in software and programming... but... I am literally currently crippled due to a number of injuries.

Pretty hard to consistently type with a wrist and arm and shoulder and more that are in need of professional, sports therapist level care.

But I can't afford that.

... I am in a situation not dissimilar from Vash, which prevents me from making basically a simulation of something like it... which is painfully ironic.

So, the short answer to your question, why doesn't this game exist?

... Because I am too injured to make it.