Why Bork on ezreal?
I'm not an adc main anymore but I really enjoy playing ezreal. I hit gold 3 last season, ended gold 4, so I know at least the basics of the game and item layout etc. But I can't figure out for the life of me why people take Bork on ezreal when they are like no tanks on the enemy team.'I see it even in challenger/diamond streams. Am I missing something? Wouldn't you rather just bloodthirster if the entire enemy team is made of squishies and bruisers? I would totally get it if it's a tanky enemy but otherwise I'm lost... Anyone?

would bring only 20% chance
meh, just attack speed and a bit of crit, and Q can't crit, also you don't have IE so crit isn't as good
You'd lack sustained damage compared to botrk
no mana problems with manamune iceborn, you also don't need more than 30% cdr because if you have higher cdr the cd of Q becomes lower than the cd of iceborn procs.