2 bonus actions is crazy powerful, especially when multiclassed.
Monk’s flurry of blows is two attacks in one bonus action. Open hand monks also have a homebrew rule that also gives you extra bonus actions.
6 attacks in your bonus actions alone, and if you have haste and took two levels of fighter for action surge, you’re basically unstoppable.
I’d be more annoyed by how broken this is if not for monk / rogue already being my favorite 5E class combo, so now I’m just enjoying the power fantasy.