To tell east from west you have to pick a north (map north =/= minimap north)
If you say 'left turret', anyone with half a brain will assume you're refering to the turret to the left of the spawn... what else?
Now if you say 'west turret', those who take directions from their map will go one side, those who use their minimap will go the opposite side.
West/east is just as confusing as left/right to not-so-smart people who just follow whatever direction their character is facing.
You just have to choose: the one that requires the least thinking (thus more effective) or the one that's gonna make you look cooler to yourself and your mom whos watching you play.