How does it “break the game”?

And in the vanilla game the distance that NPCs will aggro you is ridiculously low, since one of Funcom’s big updates. It’s really unimmersive and extremely easy - so no wonder you argue that a stealth mechanic “isn’t needed”.
But this is a problem inherent with the game balance itself, and it wasn’t always like this, because in earlier updates, NPC’s did aggro you at further distances - just like in this popular mod below:

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