To be fair, Dota has imbalance in it's own ways considering that the lack of a fixed map position setup allows for more imbalances to be seen between individual champions and how well they do at clearing objectives for victory in the game.
But yeah, that's pretty much Riot's method; it has helped some champions, thankfully, as seen in the patch before Gnar's, as it helped to balance out the choice of carries in botlane.