User blog comment:Unevent/Hybrid items!/@comment-5266525-20130519141204

You've completely ignored the rest of what Xypherous said, though.

There are only, what, three legitimate hybrids in this game. Jax, Kayle, Akali... and who else? They are an extremely small class of champion. Xypherous went on to state that making a ton of items to make these hybrid champs useful (as hybrids) is basically equitable to making a ton of items that are practically useless on any other traditionally scaling champion. If you buff the numbers on these hybrid items to actually make them useful to the majority of the champion base then hybrid champions who can make full use of them are now overpowered and have to have their ratios geared down because of it, meaning they can't actually do what their hybrid scaling advertises and get a mix of AD/AP items.

If there were a much greater proportion of hybrids in the game then adding more items for them would be a suitable and fairly obvious solution, but as it is there's just a tiny handful of them.