ayy lmao Azir main over here.
I can tell you why the 47% winrate is there. When I first started azir it was god awful, I tried building cooldown and didn't know what to do with it, like when you're about to get down with yo girl for the first time, but now when I see Azir being free I get to see where Azir newbs fail.
The biggest mistake I see is that some build a Rabadon's and some magic pen boots, guys pls, Azir is not the average mage, he does high dps and his passive is what makes him so special, sure you get a turret, but if you're rewarded for getting cooldown, take the chance to build cooldown for more power yo. However, there are cases where you CAN put the cooldown for the 2nd or 3rd item. People also play Azir like the Q is the most useful ability he has, wrong honey, Azir is not THAT basic mage, he is the love child of an adc and a mage, he takes the skill of a mage to become as powerful as an adc, you need to utilize all those abilities Ascension gave you, Q is the positioning and attack, you CAN use it for the damage, OR you can use it to close off an exit for the opponent and play with them, W is.... well duh, tower=ded, soldier=alive, E is an escape AND an initiator, mastering E is what even I try to achieve, I make some mistakes with it, but it's what changes everything, a knockup to interrupt and synergies with the ult(UNF).
TL;DR
Azir has high dps, don't shove AP down his throat if you can't suffer the consequences
build cooldown
He's high skill cap for a reason
E is a weapon as much as it is a tool.
I can ramble all day about Azir, but I made the basics short because I don't wanna bore ppl ;-;(though I take advice on him too, I'm not THE AZIR GOD, but he's my main and I like hearing about him)
P.S. I usually build a RoA first on azir... try it ;D