Why did Youmu's Ghostblade lose it's PBE Active?

For those who don't know, during the assassin rework Youmu's ghostblade got a new active that said something like this.

"Blocks the next incoming basic attack." completely losing it's movement speed and attack speed steroid. I feel like this item would have been interesting, imagine an assassin fight Vayne and using this active to block her third shot? Another thing that i find interesting is how this item probably wouldn't be built on ADC anymore(new flash it still is built on ADC's) if it had this active, it completely removes this item from their radar since it gives nothing that they would like.

Buuuut in classic riot fashion they overall nerfed the item, making it a bad item on it's intented user's because SOMEONE (looks at ADC's) decided to abuse it. And instead of changing it so they can't use it anymore they just nerf the item overall.

I feel like the assassin reworks, while they made the champions much more interesting and brought them back up to date, the other issues of the class were not recognized. One issue is Itemization, assassin itemization isn't balanced around the assassins because if your an AP Assassin mages can abuse your items and if your an AD Assassin, ADC can abuse them. This makes their builds, in most cases, less gold efficient and overall nerfed meaning that champions that can't make up for that difference fall behind. The problem with this is that an assassin now has to be much further ahead than his opponents, he has to snowball and while assassins are supposed to snowball, riot wanted to remove the feast or famine play style and they failed. This, to me and many other assassin player's aids in the failure of the assassin reworks.

What i'd like to see is riot take a look at what could have been done better itemization wise for the assassins and start looking at ways to prevent new assassin items from being abused by ranged champions. (hint, hint.)