Why Lux has become cancer

Not too long ago, Lux was a relatively balanced champion who could go mid or bot. But last year as you know, she underwent a couple of changes. Her light binding was changed so that it applied the full effect to the second target, and the radius of lucent singularity was increased. I'll admit, I wasn't really playing the game when these changes came out, so I don't really know what the context of these changes were. But they seem pretty pointless to me. All they did was make lucent singularity almost impossible to dodge, and removed an interesting disadvantage to light binding that made sense. This resulted in Lux becoming the cancer that she was a few months ago. And because of this, Riot had to nerf her shield, rendering it virtually useless. This has resulted in her having an imbalanced kit, which is now focused on her damaging abilities, rather than on her shield or even her utility. This is not what Lux should be, and to me, these changes were made to Lux just for the sake of change.