They do teach "you."
-You should find a good buddy.
-You should know your buddy.
-You should be familiar with your buddy.
-You should be next to your buddy, not just in the same ocean.
-If you're buddy decides to take off and YOU don't notice it, then YOU are obviously in the wrong in addition to him/her. From his/her perspective, YOU took off instead. YOU should have followed him if YOU were paying attention and are such a dependable buddy in the first place. Loyalty goes both ways, ya know?
That's what I learned in my OW course in Key Largo, at least.
Then your open water course sucked. I teach the you's:
You are responsible for your equipment. Check yours.
You are the one who needs your own safety equipment.
You should be navigating as well as the one in front.
You should be able to affect self-rescue.
You should pay attention to your surroundings and conditions.
You should plan your own dive, and not just let your buddy do it..
You should not trust Anyone else with you life.
You should choose a trustworthy dive partner, and communicate.
Many aren't teaching people to be thinking, independent divers. It's just lazy.
If both buddies are doing the yous, then all have a good dive.