Two question about itemization (Yasuo and Azir)

I'd say nashors has more to do with morello no longer giving attack speed (passive change), so you get +10% atk speed until level 8 (20%), as opposed to +25% as soon as you had codex and idol, on top of more damage and mana regen.

Rylais also is now brutal with soldiers, so you have the chance to get more than 1 AA off without investing into 2.5 attack speed (exaggerating)

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1. Trinity force is strong on Yasuo due to him being able to dash to a target and then use the proc very easily. HE also benefits from almost every stat except the mana, much like Rengar who used to build trinity force quite often

2. Nashor's has always been on ok item on Azir but with the recent changes to his passive not giving attack speed relative to his CDR Nashors has become a more attractive option for AS/AP/CDR which are all stats that Azir benefits from greatly

But Yasuo doesn't have good base AD, and Trinity is very expensive and delay his Infinity Edge, as well as giving less crit. Why would one build this item on him?