You also get the ability modifier to the off-hand damage without Two Weapon Fighting style.
A level 3 Rogue Thief with 3 attacks is a ridiculous damage dealer. I mean.. two weapon fighting needed some love but this is bonkers. Stealth range is even more broken: Zhentarim hideout, half of Goblin camp, dark grove are all more or less soloable with one rogue and time.
Solo kill list: One stupid evil (displayed alignment) Githyanki warrior, a dark grove, a Zhentarim hideout full of "experienced" rogues, half a Goblin camp including two hobgoblins, two minotaurs, a bunch of underworld monsters and their wannabe sorcerous overlord
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