Item Diversity is non-existent

You should have a large plethora of ways to build a champion, but that just isn't true in LoL-

Adc? If you are Vayne or Kalista instead of BT you build BORK and instead of those two items if you are Graves just build phantom dancer.

So let's begin with attack speed items, you can choose between these items: if you are an adc, so you have 4 differnet choices for an attack speed item. All of these items are bought for two reasons: Stats and synergy.

When I see these items I only look at the champ I am playing.

Jhin? Jinx? Lucian? Do you just want a bunch of stats PLUS a massive passive?

So basically if you are an ADC you are buying for item passives. And that's it.

Okay, that is just marksman though. How about tanks?

Do you need armor stats? Do you need MR stats? Do you want waveclear? Do you want HP? Do you want to survive longer against an adc?

This is how it is for EVERY class because of the lack of diversity with items. Items in this game are so dependent on champion choice because of the fact that there is a serious lack of item diversity. So what gives, why can't champions have more items to choose from?