Why don't we have more items and/or abilities that reduce attack speed?

Currently, we have only a very few items ( ) and abilities ( ) that are capable of reducing the enemy's attack speed. We also have .

Still, why don't we have more? Is that because they are too powerful and crippling against AD champions?

Because with the way that AD champions are currently, I feel that more attack speed slows would solve or at least mitigate the problem. Let me explain: I had the idea to create this thread when I was reading a thread about . She has a powerful on-hit effect that deals true damage based on the enemy's max health. This is almost impossible to counter, with the only actual counter being attack speed slows (not stacking health is not pratical since then you will die quickly to enemy's burst). If we had more attack speed slows, Vayne wouldn't be as powerful as she currently is. Attack speed slows would also help in countering other ADCs. This would actually allow Riot to "buff" them in many interesting ways and give them more items, even ones that could possibly counter attack speed slows.

I am on opinion that the only reason not to add more attack speed slows is because it would be too crippling to AD champions. It would be a good way to balance champions such as Vayne, or , or , , , , , , , , or many other champions that are reliant on attack speed. On other hand, it could also have the side effect of leaving them completely useless. On another hand, however, attack speed slows are useless against caster champions, especially AP ones such as .

Unfortunately attack speed slows have the same problem as silence, in that it is extremely crippling against some champions, but useless against others. I am still thinking whether we could have more abilities and items that slow attack speed. ' barrel used to have that effect before his rework. I don't know why it was removed. However, ' attack speed slow was removed for a good reason.