If azir turrets are guarding the nexus, why can they be ignored and just attack the nexus directly?

because logic is too much to ask for in this game.

Intentional, more than likely. Azir towers can be set up anywhere on the map, excluding enemy inhib and nexus. If you put a tower in the enemy inner mid why should they have to destroy it to attack your mid inhib tower? Same rule applies in the opposite. Enemy Azir sets up a tower why should you have to destroy it to push a lane?

I guess is intentional, simple bcuz say you have pushed to nexus and he makes one on an outer turret, the time to run back, kill it and get back to nexus is quite a bit, making him a little TOO GOOD at single defending nexus with more of a gimick trick then defense.