but back to topic. thiefs getting a second bonus action is something that larian invented. it isn't in the original rule set of 5e, and for good reason.
I'm guessing it was meant as a concession since they made Disengage, Dash and such bonus actions for everyone. Then they realised the Rogue had basically been reduced to a Sneak Attack feature, and decided that the non-arcane path could get a second bonus action. But likely these choices were made separately and the second as a response to the first rather than both of them being part of a balanced design approach, so now mechanical premise (the D&D 5th edition ruleset) slowly gets eroded and Larian will probably come up with new modifications to the ruleset to fix their previous modifications to the ruleset... It could easily turn into a domino-effect of "fixes" because every time they modify a class or a feature it unbalances two others, which then need "fixing", and so on...
