Why do so many believe that they should be allowed to get true damage for free and invalidate an entire class of champions, tanks?
Some of the most oppressive top laners were already oppressive before this rune. If you want to tank bust then you should have to sacrifice a part of your build to do it, ex. buying Lord dominiks regards or mortal reminder, or relegate that responsibility to your adc.
Conquer is a crutch to give certain champions much easier early game dominance when the worst abusers have absurdly high damage, true damage in their kits or burst. Most of them have insane mobility as well.
Conqueror should be removed, period.