Why is Ashe's permaslow becoming more readily available to her?

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You got a problem that they're trying to make her op?

I'd like to see a place where Ashe is picked 100% in all comp matches

Her Perma slow is a signature move/passive/whatever

They can't un-sylvannas her, hell naw.

The permaslow does not have to be a permaslow to still be a signature move; having a powerful slow on her auto attacks for a time period would still fulfill the same theme of her being an archer who uses her arrows to freeze enemies and slow their advance. This isn't as serious of a theme as other champions have, either, as she does not seriously pay in anything other than mobility, which arguably serves the same role as the permaslow does in relation to avoiding enemies. Her damage isn't as high as other hypercarries, yes, but her W has deceptively high DPS because of the relative ease of use and the low cooldown. Furthermore, her utility is still pretty good and can be oppressive if she is ahead since you can't realistically escape unless you have extremely high mobility yourself. As a final point, please do not bring up Kalista as another ADC with high utility that also has good damage since the creation of one abomination does not justify the resurrection of another.

As a helpful suggestion to Riot, I suggest they make the passive have a greater reward, such as being a true freeze and stunning them or rooting them, but greatly reducing the uptime so that she doesn't just permaslow you like she did, currently does, and will do in the future.

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Riot wants her to be a quintessential "Utility Marksman" that can apply both a wide amount of CC as well as smart application of damage.

Ashe herself has 0 mobility and no escape other than kiting and blowing her ult in a pinch. She also didn't have anything in the way of "alternate" damage such as HP shred like Vayne/Kog'Maw or any kind of actual AD/AS steroid like Jinx.

Ashe was always mean to be the ultimate Kiting ADC, and this allows her to do so. Whether or not it will be "healthy", we'll have to see.

I kind of see her almost like an opposite to Kallista now. Kal has perma-mobility by hopping on her autos. Ashe has perma-slow on her autos.

She does not need a permaslow to be a utility marksmen. Giving her short-term but stronger moments where she CCs you would be a better path to take, as this lets you choose where your smart application of damage in addition to your smart application of CC will go. Kalista also isn't a good justification for this either, as Kalista is one of the most frustration experiences if you had the gall to pick something that doesn't have high burst or instant/targeted CC. Ashe will not be as extreme as Kalista is for sure, but this is not a good route to take when such a fantasy can easily be applied in much tamer ways that are also situationally more satisfying.