there allready are items that are only being used by a very few champions and that is generally a GOOD thing. we have SO MANY champions that it should be only natural for them to use different items. sword of divine was a wonderful item because it gave you a very big power but at the cost of basically disabling the item afterwards. it gave good attackspeed while off cooldown so if you didnt use it, it was decent. it gave SUPER power while active for 3 seconds and it gave nothing while on cooldown.
even tho it was really powerful, it also had its downsides and you needed to be skilled to use it. it was one of the most wonderfully designed items we ever had in league and it showed perfectly well that you dont need alot of stats for a good active to be viable.
this new assassin blade is the perfect example of boring and retarded itemization. it gives exact standard amounts of stats and the only thing that differenciates it is its passive that only benefits a very few champions. maybe its going to be very good on a couple of champions as fourth, fifth or sixth item but the fewest of few will buy it first or second. i can absolutely see zed, talon and renekton with it and it looks like its an item specifically designed with zed in mind but its a really stupid item because it gives everything you need in raw stats and the passive has absolutely no downside either. its just a GOOD ITEM for some champions and depending on how GOOD it is, everyone or no one will buy it.
sword of the divine was the best item in the game and the worst at the same time. it gave you the biggest power if used correctly but it gave you absolutely nothing if you sucked with it. its a bit similar to zhonyas except that zhonyas gives alot more stats but its currently the strongest item in the game. good zhonyas use decides the outcome of duels, teamfights and entire games but not every champion uses it as one of their core items. thats GOOD. ap champions have pretty good and diverse builds and i like it, especially since there are almost always at least two viable builds for every ap champion. they have strong actives, strong passives, strong stats. alot of good stuff. they have the tear that gives the scaling, they have rod of ages for scaling and different items for different purposes and roles.
AD items and also defensive items barely have this diversity. you see, maybe a 150 ad item would be OP because 150 is too high of a number but why dont we have cost-efficient AD? it should be possible to buy alot of raw stats with decent small passives/actives for champions who only need one or two stats and not all this weird shit.
i would like to take pantheon as an example. he needs exactly 3 stats which are AD, armor pen and cooldown reduction, CDR being the least important one. now except for the jungle item "warriors enchantment" there is not a single item in the game that he would want to buy. every item has wasted stats and stupid passives that he doesnt want.
what we need is more items that give specific powers to whoever wants to use them. like, who uses statikk shiv now? no one. when statikk was so mega strong, who used rapidfire? no one, because you dont really want "more waveclear" as nowadays, most adcs have really good waveclear and the thing you really want is simply more damage or combat utility. both items are the same and everyone will buy the passive that is better even if its just by 1%. its simply better. there are no situational items in your core, especially not for marksman.
but if there are more diverse items, there can be more diverse builds also varying from player to player because the items are so different, you also play with them differently and that promotes individual playstyles.
i will give you an example, and then im done here for today.
shyvana jungle is usually played with devourer botrk. these are the two core shyvana jungle items that basically every single high ranked shyvana player (i checked, every single one in the entire world) builds. EVERYONE. i am the best shyvana player in europe and i used it only for a short time until i discovered that in season 5, titanic hydra second is much much much better than botrk and in season 6 i use trinity force. im the only d+ shyvana player IN THE WORLD to do this, especially the titanic hydra thing, and im not doing it because i like to be cool but i do it because i believe it truly is the better thing to do. its just flat out better for how i see and play the game.
this is what i call diversity. i have options that are really good and i can choose from them depending on how i play. between statikk shiv, rapidfire cannon and runaans hurricane, there is no diversity. you buy whats best. no argument to be made.
(and arguably 
) which are themselves useful for every AD, then you have 5 more items if you feel like getting a little crit chance. (
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