User blog comment:Care Level/Underlying Systems Rework: Differentiation between Attacks and Spells/@comment-24204000-20140105233345

the big problem with this is, now you have to figure out what counts as 'weapon spell', and that isn't clear and obvious.

And this negates many of the advantages you mention. Need to memorize what breaks spell shield=need to memorize what's a weapon. Need to memorize what morganna can't block, and what Jax can. Need to rebalance morganna and Jax to account for this.

Then add in areas where you are just plan wrong. Cait doesn't spot using peacemaker late game, and Sivir still uses boomerange (which already scales off of total AD). AD casters already have items they like already (hydra, brutalizer), and can make good use out of several AD marksmen items. It's not hard to fill out a 6 item build for ad casters, and most have several options for the later items.

Basically, I don't see any real advantage. There would be just as much inconsistancy, just as much need to memorize, just as much (if not more) problems in balancing. Then you add to that a whole lot of work, and constant debate over what should count as a 'weapon spell'. The upshot would be a whole lot of work and arguement for not real gain.