why ashe now builds trinity?

according to u.gg i remember when the recommended build was btork and runaans now it's essence reaver and trinity ? i'm wondering.. why so? i don't recall particular changes that justifies that in marksman itemization also, the secondary rune was the mage tree for additional damage now it's the inspiration tree for more boots and sustain with biscuits what's up with that? honestly curious in why the meta shifted this way
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