Unsatisfied with the balancing

I feel like those in charge of balance do a poor job of actually balancing problematic champions. Whenever a champion is too strong and ends up getting a nerf, its rarely to the cause of what makes the champion overpowered. Instead its to some other aspect that makes little to no change of the strength of the champion. Then since the champion is still problematic it receives more nerfs until at some point the actual cause gets nerfed but combined with the previous nerfs the champion goes from overpowered to underpowered/weak. I consider that as a failure of balance. Champions can have niches but when that niche becomes overwhelmingly strong that it warrents nerfs then just nerf the main cause so that the champion still remains viable but not overpowered.