User blog comment:Emptylord/Class Reworks - Itemization Follow-up/@comment-5035765-20160512211319/@comment-1330314-20160518231553

Hold on. Nerfing the numbers on champions and items are balance changes. Giving items CDR isn't a balance change, it's a design change. One does not follow from the other, and you are again trying to argue against a design change by invoking a potential (and temporary) balance upset.

Also, the champions listed for Gunblade on LoLKing are (in order):
 * Akali, a "true hybrid" whose five top items are Gunblade, Zhonya's, Rylai's, Lich Bane and Rabadon's... so.
 * Jax, the only champion with a proper hybrid build on the list.
 * Teemo, a champion whose only vaguely non-AP item is Runaan's, an item used for his on-hit synergy.
 * Katarina, a champion who, despite having some AD ratios, builds.
 * Mordekaiser, who goes, only diverging to build health or resists.
 * Evelynn, who builds with a few tanky items.
 * Fizz, a assassin.
 * Shaco, exclusively on his build.
 * Kennen, a mage.
 * Kayle, another so-called "true hybrid" champion who stacks alongside on-hit items.

Point being, none of these champions care about the AD, and do not buy even a single pure AD item, even if it happens to have good on-hit synergy, and even though they gladly purchase full AP items with no special on-hit synergy (i.e. Rylai's versus Frozen Mallet, the latter of which gives better tankiness and more on-hit CC). Arguing that they "could" build AD if they wanted to doesn't cut it, because in practice they fall back to either full AP or full AD, never "true hybrid". If Gunblade gave only AP, they'd be just as happy, if not happier. The problem with Omnivore is that, despite working better on basic attacks (and only the base physical component, since on-hit effects for champions like Akali, Jax or Kayle work with spell vamp too), it has a lot of its sustain "wasted" when you blow your combo at the start of a fight, as you yourself mentioned, since at that point you're at high health or near it, and thereafter it can't restore your health fast enough. The advantage to the above spell vamp is that it saves itself up when you can't heal any further, meaning that 100% of your available sustain through that item is put to use, including when you need it the most. Katarina might heal for peanuts with Omnivore after blowing her main combo, but with Transmutation she can restore 300 health with a single Q or W.