I think I just Figured out Why Mages Feel Neglected
It's because more often than not they have to choose between staying alive OR doing damage.
Since many more recent champs have high mobility they can build glass cannon while keeping themselves alive.
Mages on the other hand are mostly immobile. If they don't want to be destroyed in seconds they have to sacrifice their damage for life.
I was playing as Vlad in a match a few minutes ago. It was a bad loss, but I noticed that I was barely hurting Rengar when i used my Q on him.
Someone on my team made the comment "you have no damage, look at your build" It was true, I only had 200 AP I had built several tanky items to deal with the enemy burst.
I don't see this as a bad thing necessarily. As long as it's evenly spread out among all the champions.